This cake works on a completely different principle than most cakes you’ve probably made before. There’s no flour, no baking powder, no baking soda — none of the usual chemical lift. Instead, the entire structure comes from one technique: whipped egg whites. Beaten properly, egg whites trap air and turn into a soft, stable foam, and that trapped air is what gives this cake its rise and its signature light, almost weightless texture.
Because there’s no flour involved, the cake ends up naturally gluten-free, and the texture is nothing like a dense, traditional sponge. It’s closer to a cross between a soufflé and a soft sponge — delicate when sliced, light in the mouth, and much less heavy than most baked sweets. That’s also where the name comes from: it rises gently, feels almost weightless, and has a soft, cloud-like character once it’s chilled and set.
The ingredient list is short and uncomplicated — eggs, Greek yogurt, condensed milk, cornstarch, and vanilla — but the technique is where this recipe lives or dies. Whipping the egg whites correctly and folding them in gently are the two steps that decide whether you get a light, airy cake or a dense, flat one.
Prep and Setup
This cake depends heavily on clean technique, so getting your equipment and ingredients staged properly matters more here than in most recipes:
- Oven: preheat to 160°C (320°F) before you start separating eggs.
- Springform pan: an 8-inch pan, lined with baking paper, with the base wrapped in foil — this is essential, since the cake bakes in a water bath and the foil keeps water from seeping in.
- A larger baking tray: for the water bath itself, big enough to hold the springform pan with room for water around it.
- Two clean, grease-free bowls: one for egg yolks, one for egg whites. This matters more than it sounds — any trace of grease, yolk, or moisture in the egg-white bowl will stop the whites from whipping to stiff peaks. A clean glass or metal bowl is the safest choice.
- Eggs: 4 large eggs, separated carefully so no yolk gets into the whites.
- Greek yogurt: full-fat, thick, and strained — thin or watery yogurt will destabilize the batter.
- Condensed milk, cornstarch, and vanilla: measured and ready to go into the yolk mixture.
Understanding the Texture: Why This Cake Works the Way It Does
Most cakes rise because of a chemical reaction — baking powder or soda releasing gas as they bake. This cake skips that entirely. The lift here is mechanical: whipped egg whites physically trap air as they’re beaten, and that air is what expands gently in the oven, giving the cake its height and its soft, delicate crumb.
That’s also why the batter has to be handled so carefully once the whites are whipped. If the air gets knocked out during mixing, there’s no chemical backup keeping the cake structured — it will simply turn dense and lose its lift.
The other ingredients play a supporting role in this structure. Condensed milk brings sweetness and body, Greek yogurt adds moisture and a slight tang without thinning the batter, and a small amount of cornstarch gives just enough stability to help the cake hold its shape after baking — without making it feel like flour is present.
Workflow: How the Steps Actually Flow
1. Preheat and prepare the pan first. Line the springform pan with baking paper and wrap the base in foil before you start on the batter — this needs to be ready the moment the batter is mixed, since the water bath setup takes a bit of time on its own.
2. Separate the eggs carefully. Yolks into one clean bowl, whites into another. No trace of yolk can get into the whites, or they won’t whip properly.
3. Mix the yolk base. Combine egg yolks with condensed milk, yogurt, and vanilla until smooth — this creates a thick, silky base that the whipped whites will later be folded into.
4. Sift in the cornstarch. Adding it to the yolk mixture at this stage, rather than to the egg whites, keeps the whites free to whip properly while still giving the final batter the structure it needs.
5. Whip the egg whites to stiff peaks. This is the step that decides everything downstream. Stiff peaks means the whites stand up on their own when the whisk is lifted. Under-whipped, and there’s not enough air trapped for lift; over-whipped, and the whites start losing moisture and can collapse later in the oven. The goal is fluffy and stable, not dry.
6. Fold the whites into the yolk mixture — slowly, in batches. Add roughly a third of the whipped whites at a time. Fold rather than stir: lift from the bottom of the bowl and turn the mixture over itself, rather than beating or stirring in circles. This is the step most people rush, and rushing it is what knocks the air back out. Done correctly, the batter should end up smooth but still airy, closer to a mousse than a typical cake batter.
7. Pour into the prepared pan, set in the water bath. The water should come about halfway up the sides of the springform pan, without splashing into the batter itself.
8. Bake gently, without opening the oven door. Even a small drop in oven temperature from opening the door can cause the cake to sink in the center before it’s set.
9. Cool inside the oven with the heat off. This slow cooling step prevents a sudden temperature change, which is another common cause of the cake collapsing.
10. Chill before slicing. This is non-negotiable for this recipe — the cake isn’t fully set until it’s been chilled, and chilling is what gives it its final, cloud-like texture.
Component Organization: What Each Ingredient Is Doing
- Structure and lift: whipped egg whites. This is the entire mechanism behind the cake’s rise and airy texture — there’s no other leavening agent doing this job.
- Richness and body: egg yolks and condensed milk. The yolks add richness and help build the base; the condensed milk sweetens the cake and gives the batter a thick, silky consistency.
- Moisture and tang: Greek yogurt. Full-fat and strained, it keeps the cake soft without thinning the batter — thin yogurt destabilizes the whole structure.
- Stability: cornstarch. Used in a small amount, it gives the baked cake just enough structure to hold its shape without introducing the density that flour would.
- Flavor: vanilla (or vanilla bean paste). This ties the flavor together; lemon zest is offered as an alternative for a fresher, brighter version.
The Folding Stage: Where Most People Go Wrong
This step deserves its own attention, since it’s the single biggest point of failure in the recipe. When combining whipped egg whites with the yolk mixture, add them in batches — about a third at a time — and fold rather than stir. Folding means lifting the mixture from the bottom of the bowl and turning it over itself, gently, rather than mixing in circles.
It feels slow, and that’s exactly the point. Speed is what knocks air out of the whites, and once that air is gone, there’s no way to get it back before baking. Done right, the batter should look smooth but still visibly airy — closer to a mousse than a standard cake batter — right before it goes into the pan.
Baking Setup: The Water Bath
The cake bakes inside a springform pan that’s itself sitting inside a larger tray of hot water — a water bath. This gentle, even heat is what keeps the texture soft and helps prevent cracking on top. The water should reach about halfway up the sides of the cake pan, but should never splash into the batter, which is why wrapping the base of the pan in foil beforehand matters.
Once in the oven, the cake rises gently rather than aggressively, with the top turning slightly golden while the inside stays soft. Not opening the oven door during baking is an important rule here — even a small temperature drop can cause the center to sink before it sets.
Cooling and Chilling: Why It Matters So Much
After baking, the cake stays inside the oven with the heat switched off, cooling slowly rather than being pulled straight out. This prevents a sudden temperature shift, which is another way the cake can collapse in the center. After about an hour in the cooling oven, it’s moved to the counter until it reaches room temperature — at this point it will still feel soft and delicate, and that’s completely normal.
The real transformation happens in the fridge. Chilling for at least a couple of hours — or overnight — firms the cake up enough to slice cleanly, giving it a smoother, slightly custard-like texture while still keeping the airy softness underneath. Skipping this step means the cake stays too soft to slice properly straight out of the oven, and can feel almost undercooked even when it isn’t. Chilling also lets the flavors settle — the sweetness balances out, and the vanilla becomes more noticeable.
What the Finished Texture Should Feel Like
The finished cake should be soft, slightly creamy, and light when bitten into — never dry or dense. It should hold its shape on a plate but still feel delicate when cut, with a slight wobble when moved without falling apart. If the texture ends up rubbery or heavy, it’s usually a sign the egg whites were either overmixed or deflated somewhere during the folding stage.
Serving Ideas
- Chilled, with a light dusting of powdered sugar — the classic, simple presentation that keeps the focus on texture.
- Topped with fresh fruit, especially sliced strawberries, whose slight tartness balances the sweetness of the condensed milk.
- With other soft berries or citrus segments, depending on what’s available.
- Served plain, letting the texture speak for itself.
Common Mistakes to Avoid
- Grease or moisture in the egg-white bowl — even a small amount stops the whites from whipping properly; use a clean glass or metal bowl.
- Rushing the folding stage — mixing too fast knocks the air out, leaving a dense rather than fluffy cake.
- Opening the oven door too early — the sudden temperature drop can cause the cake to sink in the middle.
- Using thin or watery yogurt — this destabilizes the batter and prevents the cake from rising properly.
Approved Variations (Based Strictly on the Recipe)
- Vanilla can be swapped for lemon zest, for a fresher, more citrus-forward flavor — especially suited to warmer weather.
- Topping can be adjusted: powdered sugar alone is enough, or fresh fruit can be added for color and freshness.
What doesn’t change is the core structure — the balance between egg whites, yogurt, and condensed milk stays fixed, since that balance is what keeps the cake stable.
When This Cake Works Best
This isn’t a heavy celebration cake — it fits better as a light dessert after a meal, or something to serve alongside tea or coffee. Because it’s chilled before serving, it can also be made ahead of time, and it genuinely tastes better after resting, which makes it convenient for planning ahead.
Step-by-Step Assembly Strategy
- Preheat oven to 160°C (320°F). Line an 8-inch springform pan and wrap the base with foil.
- Separate eggs into two clean bowls (no yolk in the whites).
- Mix egg yolks with condensed milk, yogurt, and vanilla until smooth.
- Sift in cornstarch and combine.
- Whisk egg whites until stiff peaks form.
- Gently fold egg whites into the yolk mixture in batches.
- Pour batter into the prepared pan, placed in a water bath.
- Bake for about 45 minutes, until golden and set.
- Turn off the oven and let the cake cool inside.
- Chill for at least 2 hours before serving.
- Dust with sugar and top with fruit, if desired.
Keto Cloud Cake
Description: A light, flourless cloud cake made with whipped egg whites, Greek yogurt, and condensed milk. Soft, airy texture with a delicate sweetness, best served chilled with fruit or powdered sugar.
Course: Dessert | Cuisine: American | Difficulty: Easy
Duration:
- Prep time: 10 minutes
- Cooking time: 45 minutes
- Total time: 55 minutes
- Servings: 10
- Calories: 141 kcal (per serving)
Ingredients:
- 4 large eggs (separated)
- 1 cup (240g) full-fat Greek yogurt
- 1 cup (240g) sweetened condensed milk
- 1 tsp vanilla bean paste (or vanilla extract)
- 1 tbsp cornstarch (cornflour)
Instructions:
- Preheat oven to 160°C (320°F). Line an 8-inch springform pan and wrap the base with foil.
- Separate eggs into two clean bowls (no yolk in the whites).
- Mix egg yolks with condensed milk, yogurt, and vanilla until smooth.
- Sift in cornstarch and combine.
- Whisk egg whites until stiff peaks form.
- Gently fold egg whites into the yolk mixture in batches.
- Pour batter into the prepared pan, placed in a water bath.
- Bake for about 45 minutes, until golden and set.
- Turn off the oven and let the cake cool inside.
- Chill for at least 2 hours before serving.
- Dust with sugar and top with fruit, if desired.
Notes:
- Bowl for egg whites must be clean and grease-free.
- Do not over-whip egg whites, or they may collapse.
- Fold gently to keep air in the batter.
- Avoid opening the oven door during baking.
- Chilling is essential for proper texture and slicing.
Medical Disclaimer: This recipe and the accompanying content are provided for general informational and culinary purposes only and are not intended as medical, nutritional, or dietary advice. Nutritional needs vary from person to person, and individuals with food allergies, intolerances, medical conditions, or specific dietary requirements should consult a qualified healthcare professional or registered dietitian before preparing or consuming this recipe. Cooking times and temperatures may vary depending on individual equipment; always ensure food is cooked to a safe internal temperature before serving. The creator of this content assumes no liability for any adverse reactions, allergic responses, or health outcomes resulting from the preparation or consumption of this recipe.
