Flourless Black Cocoa and Chia Greek Yogurt Cake
This flourless black cocoa and chia Greek yogurt cake sits somewhere between a chocolate cake and a fudgy brownie. Black cocoa gives it the dramatic color, while Greek yogurt keeps the crumb moist and chia seeds help the slices hold together after cooling.
A useful clarification: “flourless” here means no wheat flour. The recipe uses almond flour, so it is not nut-free. It can be gluten-free when every packaged ingredient is certified gluten-free and cross-contact is avoided.
Flourless black cocoa and chia Greek yogurt cake at a glance
| Texture | Dense, moist and brownie-like rather than light and fluffy |
|---|---|
| Flavor | Deep, dark cocoa with a mild tang from Greek yogurt |
| Pan | 9-inch round cake pan |
| Timing | 15 minutes prep, 25–30 minutes baking, plus cooling |
| Yield | 8 generous slices |
What black cocoa changes
Black cocoa is a heavily alkalized cocoa powder. It brings a nearly black color and a smooth, roasted flavor that people often associate with chocolate sandwich cookies. It is less sharp than natural cocoa, but using a full cup makes this cake distinctly dark and intense.
If black cocoa is new to you, use half black cocoa and half Dutch-process cocoa the first time. The crumb will be a little lighter, but the chocolate flavor will be rounder. Natural cocoa can work in a pinch, although the finished cake will look and taste noticeably different.
The ingredients that matter most
- Finely ground almond flour: Use blanched almond flour, not coarse almond meal. Weighing it is the easiest way to avoid a dry cake.
- Plain Greek yogurt: Thick 2% or whole-milk yogurt gives the softest crumb. If the yogurt looks watery, pour off the liquid before measuring.
- Chia seeds: Whole seeds add gentle structure and tiny pops of texture. Mixing them with the dry ingredients prevents clumps.
- Honey or maple syrup: Either works, but honey gives a slightly chewier crumb and maple syrup tastes a little lighter.
- Room-temperature eggs: They combine more smoothly with the yogurt and help the cake bake evenly.
How to make flourless black cocoa and chia Greek yogurt cake
1. Prepare the pan
Heat the oven to 350°F (175°C). Grease a 9-inch round pan, place a parchment circle on the bottom and lightly grease the paper. The parchment matters here because the cake is tender while warm.
2. Whisk the wet ingredients
Whisk the eggs, Greek yogurt, honey or maple syrup, and vanilla until the mixture is smooth and even. Give it a full 45 to 60 seconds; lingering egg-white streaks can bake into rubbery spots.
3. Break up the cocoa
In a second bowl, whisk the almond flour, black cocoa, chia seeds, baking soda and salt. Black cocoa tends to form stubborn little pockets, so press out any lumps before the dry mixture goes into the yogurt mixture.
4. Fold, spread and rest
Add the dry ingredients in two rounds and fold just until the last pale streak disappears. The batter should be thick enough to need a spatula, but it should still spread. Level it in the pan, then wait five minutes so the chia can begin to hydrate.
5. Bake by the visual cues
Begin checking at 24 minutes. The edge should look set, the center should spring back slowly when touched, and a toothpick should come out with a few moist crumbs. A completely clean toothpick often means the cake has already gone a little too far. Wet batter on the toothpick needs another two or three minutes.
6. Let the crumb set
Cool the cake in its pan for 20 minutes before moving it to a rack. Wait until it is fully cool to slice. The center firms as it loses heat; cutting early is the most common reason a flourless cake appears underbaked.
How to tell when the cake is done
Time is only a guide because dark pans, glass pans and ovens all behave differently. Look for all three signs together:
- The outer inch of the cake is set and may pull very slightly from the pan.
- The center is no longer shiny or loose and springs back slowly.
- A toothpick shows damp crumbs, not a glossy streak of raw batter.
The cake will stay intentionally fudgy. It should not have the airy crumb of a wheat-flour layer cake.
Troubleshooting
| What happened | Likely reason | What to do next time |
|---|---|---|
| Dry or crumbly slices | Too much almond flour or cocoa, or the cake baked too long | Use the gram weights and remove it when the toothpick still has moist crumbs |
| Wet center after cooling | The center was still loose when it left the oven | Bake in 2-minute increments until the center springs back slowly |
| Cake breaks when lifted | It was moved or sliced while warm | Use parchment and allow the full cooling time |
| Flavor is too dark or bitter | A full cup of black cocoa is very intense | Use half black cocoa and half Dutch-process cocoa |
| Chia seeds form clusters | They went straight into the wet mixture | Whisk them through the dry ingredients first |
Substitutions that work
- Honey and maple syrup: Swap them one for one by volume. The maple version may need the full baking time because maple syrup is thinner.
- Greek yogurt: A thick dairy-free Greek-style yogurt can work, but the cake may set differently depending on its starches and fat content.
- Black cocoa: Replace up to half with Dutch-process cocoa for a softer chocolate flavor. Regular natural cocoa changes both the color and acidity, so it is not an exact match.
Almond flour is central to the structure, so coconut flour or all-purpose flour is not a one-for-one substitute. Likewise, a dry granulated sweetener changes the batter’s moisture and should not be swapped directly for the honey or maple syrup.
Serving and storage
The cake is easiest to slice at room temperature or slightly chilled. Serve it plain, with tart raspberries, or with a spoonful of Greek yogurt. A small pinch of flaky salt also balances the black cocoa without covering it up.
Keep leftovers covered in the refrigerator for up to five days. Let a slice stand for about 15 minutes before serving so the crumb softens. For longer storage, wrap individual cooled slices and freeze for up to two months; thaw overnight in the refrigerator.
Frequently asked questions
Is this cake really flourless?
It contains no wheat flour, but it does use almond flour. That is the convention many flourless almond cakes use, and it is worth stating clearly for anyone avoiding nuts.
Can I make it with regular cocoa powder?
Yes, but it will be a different cake: lighter brown, more traditionally chocolatey and less deeply roasted. For the closest balance, keep at least half of the measured cocoa as black cocoa.
Do the chia seeds need to be soaked first?
No. They hydrate during the five-minute batter rest and while the cake bakes. Mixing them evenly through the dry ingredients is more important than soaking them separately.
Is the recipe keto or low-carb?
Not as written, because it contains honey or maple syrup. It is better described as a wheat-flour-free almond cake than as a keto cake.
Can I use an 8-inch pan?
Yes, but the cake will be thicker and will usually need several extra minutes. Keep the oven at 350°F and rely on the center and toothpick cues rather than the clock.
More chocolate recipes
For a more classic version, try this flourless chocolate cake. If you want another tangy, fudgy bake, these Greek yogurt brownies use the same chocolate-and-yogurt idea in bar form.
Printable recipe
Flourless Black Cocoa and Chia Greek Yogurt Cake
Ingredients
Equipment
Method
- Heat the oven to 350°F (175°C). Lightly grease a 9-inch round cake pan, line the bottom with parchment paper, and grease the parchment.
- In a large bowl, whisk the eggs, Greek yogurt, honey or maple syrup, and vanilla for 45 to 60 seconds, until smooth and no streaks of egg remain.1/2 cup plain Greek yogurt, 1/2 cup honey or pure maple syrup, 4 large eggs, 1 teaspoon vanilla extract
- In a second bowl, whisk the almond flour, black cocoa, chia seeds, baking soda, and salt. Break up every visible cocoa lump before combining the mixtures.1 cup black cocoa powder, 1/4 cup whole chia seeds, 1/2 teaspoon baking soda, 1/4 teaspoon fine sea salt
- Fold the dry mixture into the wet mixture in two additions, stopping as soon as no pale streaks remain. Spread the thick batter evenly in the pan and let it rest for 5 minutes so the chia can begin absorbing moisture.
- Bake for 25 to 30 minutes. Start checking at 24 minutes: the edges should be set, the center should spring back slowly, and a toothpick should carry a few moist crumbs but no wet batter. If needed, bake for 2 to 3 minutes more.
- Cool in the pan for 20 minutes, then loosen the edge and transfer the cake to a rack. Let it cool completely for at least 25 minutes more before cutting. For especially neat, fudgy slices, chill it for 30 minutes after cooling.
