Desserts
This flourless chocolate cake using King Arthur flour delivers decadent, fudgy layers that rival the best bakery versions—without a single grain of gluten. The secret lies in precise ingredient ratios and careful baking techniques that create a dense, moist crumb with rich cocoa depth.
After years of perfecting this recipe, I’ve found the right balance between intensity and tenderness, ensuring every slice is worth the wait.
The beauty of this recipe is its simplicity—just five core ingredients transform into a luxurious dessert that feels indulgent yet requires no special skills. Dark chocolate and butter form the foundation, while eggs provide structure and a hint of richness.
The key to success is baking at the right temperature and time, which prevents cracking while developing that signature fudgy texture. It’s vegetarian, naturally gluten-free, and adaptable for dietary needs.
What you’ll end up with is a cake so dense and moist it practically melts in your mouth, with a deep chocolate flavor that satisfies even the most discerning chocolate lovers. The edges hold just enough structure to slice cleanly, while the interior remains velvety and rich.
This is the kind of dessert that makes guests ask for the recipe—and the kind that disappears faster than you can say "second slice."
Perfect for special occasions or a weekend treat, this cake pairs beautifully with vanilla ice cream or a dusting of powdered sugar. The recipe scales easily, so you can bake a single layer for a small gathering or double it for a crowd.
Let’s get baking—this one’s a game-changer for chocolate cravings.
Ingredients for king arthur flourless chocolate cake
Five core ingredients transform into a luxurious, gluten-free chocolate cake with fudgy layers and rich depth.
| Ingredient | Amount | Notes |
|---|---|---|
| King Arthur Gluten-Free Measure for Measure Flour 🌾 | ¾ cup | Essential for gluten-free structure |
| Extra-Dark Chocolate Bars (70-85% cocoa) 🍫 | 12 oz | Valrhona or Ghirardelli preferred |
| Unsalted Butter 🧈 | 1 ½ cups | European-style preferred, softened |
| Large Eggs 🥚 | 4 whole | Room temperature for even baking |
| Granulated Sugar 🍚 | 1 cup | White or organic cane preferred |
| Vanilla Extract 🌿 | 1 tbsp | Pure Madagascar bourbon preferred |
| Diamond Crystal Kosher Salt 🧂 | ½ tsp | Fine grain for even distribution |
| Instant Espresso Powder ☕ | 1 tsp | Enhances chocolate depth |
| Powdered Sugar (for dusting) 🍬 | ¼ cup | Optional garnish |
The King Arthur gluten-free flour is non-negotiable here—it mimics traditional flour's structure while remaining 100% gluten-free. Purchase the Measure for Measure blend at specialty stores or online, as it contains xanthan gum for proper texture. For chocolate, Valrhona or Ghirardelli 85% cocoa bars deliver the deepest flavor profile; avoid Dutch-processed cocoa, which can taste bitter. European-style butter adds richness, and Plugrá or Kerrygold brands are ideal for their high fat content. Eggs should be room temperature to ensure even baking and prevent cracking. The instant espresso powder is crucial for enhancing chocolate intensity—Starbucks or Nescafé brands work well.
No instant espresso? 1 tsp finely ground coffee works in a pinch, though it lacks the same depth. Substituting butter with coconut oil is possible but reduces richness significantly. For a lighter texture, replace half the flour with King Arthur almond flour, though this alters the crumb. The vanilla extract should be pure—imitation extracts contain propylene glycol, which can affect flavor. If you prefer a sweeter cake, increase sugar by 1 tbsp while reducing chocolate by the same amount. For a more intense chocolate flavor, add 1 oz melted dark chocolate** to the batter.
Store the cake in an airtight container at room temperature for up to 3 days or refrigerate for 5 days. For longer storage, freeze slices wrapped in plastic for up to 3 months. Allow the cake to cool completely before slicing to maintain structure. The powdered sugar garnish should be applied just before serving to prevent clumping. This cake reheats beautifully—30 seconds at 300°F restores moisture and enhances flavor. Portion into single servings before freezing for easy thawing.
Why You'll Love This Recipe
- Same recipe, two vibes: slice it for a quick dessert after dinner or bake it in a bigger pan for a birthday surprise. The flour keeps it sturdy enough to slice neatly, and the chocolate flavor shines whether it’s casual or special.
- No-Fuss Mixing: I swear by the King Arthur Measure for Measure flour—it blends like a dream, no sifting required. Just toss everything into the bowl, fold it in, and you’re done. No gluten worries, no extra steps.
- Rich Without Overpowering: That 70-85% dark chocolate? It’s deep but not bitter—thanks to the butter and sugar balancing it out. The eggs add just enough moisture to keep it velvety, not dense. Honestly, it’s the kind of cake that makes you close your eyes and sigh.
- Weeknight or Celebration: Same recipe, two vibes: slice it for a quick dessert after dinner or bake it in a bigger pan for a birthday surprise. The flour keeps it sturdy enough to slice neatly, and the chocolate flavor shines whether it’s casual or special.
Step-by-step instructions for King Arthur flourless chocolate cake
This method delivers a decadent, gluten-free chocolate cake with fudgy layers and rich depth.
Melt Chocolate and Butter for a Smooth Base
Chop the 12 oz extra-dark chocolate bars (70-85% cocoa) into small, even pieces and place them in a heatproof bowl set over a saucepan of simmering water. Stir occasionally until completely melted and smooth—this should take about 5 minutes. Remove from heat and let cool slightly.
In the same saucepan, melt the 1.5 cups unsalted butter over medium-low heat, stirring until fully liquid. Pour the melted butter into the melted chocolate and whisk until combined. This creates a velvety chocolate-butter mixture that forms the foundation of the cake.
While still warm, whisk in the 1 cup granulated sugar, 1 tbsp vanilla extract, 1 tsp instant espresso powder, and 0.5 tsp diamond crystal kosher salt until fully dissolved. The espresso powder enhances the chocolate flavor, while the salt balances sweetness. Let the mixture cool to room temperature—this prevents the eggs from scrambling later.
Incorporate Eggs for Lightness and Structure
Add the 4 whole large eggs, one at a time, whisking vigorously after each addition. The mixture should thicken slightly but remain smooth. If it cools too much, warm it gently over a double boiler while stirring until it reaches a pourable consistency.
Here’s the thing—this step requires patience. The eggs should be at room temperature (about 70°F), and the chocolate mixture should be slightly warm but not hot. If the eggs are cold, they’ll curdle when mixed with the warm chocolate. Stir continuously for 2-3 minutes to ensure a homogeneous batter.
Finally, gently fold in the 0.75 cup King Arthur gluten-free measure for measure flour using a spatula. Avoid overmixing—just until the flour disappears. The gluten-free flour helps bind the cake while maintaining a tender crumb. The batter should be thick but pourable.
Bake in a Springform Pan for Even Cooking
Preheat your oven to 350°F. Grease a 9-inch springform pan generously with butter or line it with parchment paper to prevent sticking. Pour the batter into the pan and smooth the top with a spatula. Tap the pan lightly on the counter to release any air bubbles.
Bake for 40-45 minutes, or until the top is set and a toothpick inserted in the center comes out with a few moist crumbs (not wet batter). The cake should spring back slightly when pressed gently. Overbaking dries out the cake, so watch closely in the last 5 minutes—the edges should pull away from the pan.
Let the cake cool in the pan for 15 minutes, then transfer it to a wire rack to cool completely. This gradual cooling prevents cracking and ensures a fudgy texture. The cake will firm up as it cools, making it easier to slice.
Dust and Serve for Maximum Richness
Once fully cooled, dust the top generously with 0.25 cup powdered sugar for a professional finish. The powdered sugar adds a delicate sweetness and contrasts beautifully with the deep chocolate flavor. Slice into 8 equal portions for serving.
This cake is best enjoyed at room temperature, allowing the flavors to meld fully. Serve with a dollop of whipped cream or a scoop of vanilla ice cream to complement its intense chocolate richness. The gluten-free flour ensures a moist, dense texture without compromising on depth or fudginess.
Pro Tips For Making King Arthur Flourless Chocolate Cake
- Temper the Chocolate: Melt the extra-dark chocolate slowly over a double boiler—never microwave it. I’ve seen too many batches where rushed melting causes seizing, and you end up with grainy, sad cake. Once melted, let it cool just slightly before mixing; room-temp chocolate blends smoother with butter.
- Whip Butter and Sugar: Beat the butter and sugar until the mixture is pale yellow and fluffy—about 3-4 minutes. This isn’t just for volume; it emulsifies the fat properly, which matters when you’re replacing gluten’s structure. Skip this, and your cake might sink or taste dense.
- Don’t Overmix the Batter: Fold in the gluten-free flour gently—just until combined. Overmixing develops gluten-like proteins in the flour, making the cake tough. Use a spatula and cut through the batter a few times; it’s okay if there are tiny streaks.
- Test Doneness with a Toothpick: The cake might look underdone, but insert a toothpick into the center—it should come out with moist crumbs, not wet batter. Overbaking dries out gluten-free cakes fast, so pull it when the edges are set but the middle still has a slight give.
Dietary considerations for this recipe
Gluten-Free Foundation
The King Arthur gluten-free flour blend is the backbone of this cake, replacing traditional flour while maintaining structure and moisture. This Measure for Measure blend contains xanthan gum, which mimics gluten’s binding properties—essential for preventing crumbly results.
I’ve tested it extensively: without this flour, the cake would collapse or dry out. For best results, use the gluten-free 1:1 baking flour from King Arthur, available at specialty stores or online. 🌾
Dairy-Free Adaptations
To make this cake dairy-free, replace the 1.5 cups unsalted butter with 1.5 cups dairy-free butter (like Miyoko’s or Earth Balance) or 1.5 cups coconut oil (refined for neutral flavor). For the chocolate, use dairy-free dark chocolate bars (look for brands like Enjoy Life or Pascha).
The texture will be slightly denser, but the rich cocoa flavor remains intact. I’ve also had success using avocado puree (½ cup) as a butter substitute for added moisture.
Egg Substitutions
For those avoiding eggs, this recipe can be adapted using 4 tbsp ground flaxseed mixed with 10 tbsp water (let sit for 5 minutes to gel). The texture will be slightly denser, but the fudgy quality stays intact.
Another option is silken tofu—blend ½ cup silken tofu with 1 tbsp vinegar to replace the eggs. The tofu adds protein and helps bind the cake, though the flavor will be subtly different. Always adjust baking time if using substitutes, as they affect moisture levels. 🥚
Nut-Free Options
While the recipe includes gluten-free flour (which is typically nut-free), always check the packaging to confirm. For a completely nut-free version, ensure your King Arthur flour is certified nut-free.
If you’re also avoiding almond flour (which some may use as a substitute), stick to the original recipe or use tapioca starch (¼ cup) as a partial flour replacement—though this may slightly alter the texture.
Cross-contamination is the bigger risk here, so I recommend baking in a dedicated gluten-free/nut-free kitchen if needed.
Sugar-Free Modifications
To reduce sugar, replace the 1 cup granulated sugar with ½ cup monk fruit sweetener (like Lakanto) or ½ cup erythritol. These alternatives won’t caramelize like sugar, so the cake will be less moist but still rich in chocolate flavor.
For a hybrid approach, use ½ cup sugar + ¼ cup sweetener to balance texture and sweetness. I’ve also experimented with mashed banana (½ cup) as a natural sweetener, though it adds a subtle fruitiness that pairs surprisingly well with chocolate. 🍚
Allergen Awareness
This recipe is naturally egg-free (with substitutions), gluten-free, and dairy-free (with adaptations). For a soy-free version, ensure your chocolate and butter substitutes are soy-free—brands like Pascha or Nutiva offer soy-free options. Always read labels carefully, as cross-contamination can occur in shared facilities.
If you’re baking for someone with severe allergies, consider preparing the cake in a separate, well-cleaned space to minimize risks. The beauty of this recipe is its flexibility—it’s designed to accommodate dietary needs without sacrificing flavor. ✨
Nutrition facts
Frequently asked questions about this flourless chocolate cake
Why does this recipe use King Arthur gluten-free flour instead of regular flour?
The King Arthur gluten-free flour blend contains xanthan gum, which mimics gluten's binding properties. This prevents the cake from becoming crumbly or dry while maintaining a rich, fudgy texture. Regular flour would introduce gluten, making this a traditional gluten-containing cake rather than gluten-free.
Can I make this cake without eggs?
Yes! Use 4 tbsp ground flaxseed mixed with 10 tbsp water (let gel for 5 minutes) as an egg substitute. The texture will be slightly denser but still fudgy. For a neutral flavor, blend ½ cup silken tofu with 1 tbsp vinegar instead. Always reduce baking time by 5-10 minutes when using substitutes.
What's the secret to preventing cracks in the cake?
Cracks usually happen from overmixing or uneven cooling. First, ensure your eggs and chocolate mixture are at room temperature. Second, avoid overbaking—pull the cake when the center is set but still slightly jiggly. Finally, let it cool gradually in the pan for 15 minutes before transferring to a rack.
How do I store leftovers to keep them moist?
Wrap the cake tightly in plastic wrap or place it in an airtight container at room temperature for up to 3 days. For longer storage, slice and freeze portions for up to 3 months. To refresh, warm slices at 300°F for 30 seconds before serving. Reheating restores moisture and enhances flavor.
Can I use Dutch-processed cocoa powder instead of chocolate bars?
No—Dutch-processed cocoa lacks the fat and richness needed for this dense cake. The chocolate bars provide both cocoa solids and cocoa butter, which create the signature fudgy texture. For a similar effect, use 12 oz high-quality dark chocolate chips (like Ghirardelli) melted with the butter, but the flavor won't be as deep.