The "I want cake but I'd also like to keep my blood sugar where it is" cake. Light, airy, sprinkled, under 150 calories per slice and around 15 grams of protein. It's not a Valrhona-level dessert — it's an engineering problem: how do you get cake-like structure, mouthfeel, and sweetness from egg whites, protein powder, and Greek yogurt?
The answer is meringue science. Whipped egg whites give you the lift and crumb. Self-rising flour and protein powder give you the structure. Greek yogurt and sugar-free pudding mix give you the frosting. Sprinkles do the actual heavy lifting of "this is a birthday cake."
I make this when my kid wants cake on a Tuesday and I want to be a yes-dad without buying a sheet cake from the supermarket.
Serves 4 · 6-inch mini double-layer · about 25 minutes total
Ingredients
Cake
- 4 medium egg whites, room temperature
- 1 tsp cream of tartar
- ¼ cup monk fruit sweetener (or allulose, or erythritol blend — Lakanto Classic works well)
- ½ tsp vanilla extract (clear vanilla if you want a white cake)
- ½ cup self-rising flour
- 1 scoop (~30 g) vanilla whey or plant protein powder
Yogurt frosting
- 1 cup nonfat plain Greek yogurt (use real Greek-strained, not "Greek-style")
- 1 tbsp sugar-free instant pudding mix (vanilla, cheesecake, or white chocolate)
To finish
- 1 tbsp rainbow sprinkles
- Optional: a few fresh berries
Method
1. Heat oven to 350°F. Spray two 6-inch round cake pans with nonstick spray. Don't skip — the egg-white base sticks to bare metal.
2. Whip the whites. In a clean, dry bowl (any trace of fat kills meringue), beat the egg whites with the cream of tartar on medium speed until foamy. Add the monk fruit sweetener and vanilla. Increase to medium-high and beat until stiff, glossy peaks form. Lift the whisk — the peak should hold straight up without drooping.
3. Fold in the dry. In a separate bowl, whisk the flour and protein powder together. Sprinkle a third of the dry mix over the meringue and fold gently with a spatula, going down through the center, around the side, up and over. Repeat with the second and third additions. Keep the air in the eggs — this is what makes the cake rise. Don't stir, don't beat. Just fold.
4. Divide between pans. Spread evenly. Tap once gently on the counter to release the biggest bubbles (but not hard — you want most of the air to stay in).
5. Bake 15 minutes until the tops are lightly golden and a toothpick comes out clean. Don't open the oven before 12 minutes — the meringue can collapse.
6. Cool in the pans for 5 minutes, then turn out onto a wire rack to cool completely. The cakes will be more delicate than a normal cake — handle gently.
Frosting
In a bowl, whisk the Greek yogurt with the sugar-free pudding mix. Let it sit for 5 minutes — the pudding mix thickens the yogurt to a spreadable consistency.
Assemble
- If the bottom layer has a dome, slice it flat with a serrated knife.
- Place on a plate. Spread with half the yogurt frosting.
- Top with the second layer (upside down for flat top).
- Spread remaining frosting on top.
- Shower with sprinkles. Add a few berries if you want.
Eat within a few hours — the yogurt frosting is best fresh.
Notes from the cook
- Cream of tartar is critical. It stabilizes the meringue. Without it, your egg whites will deflate as you fold in the dry. ½ tsp lemon juice can substitute in a pinch.
- Room-temperature whites whip faster and to greater volume. Take them out of the fridge 30 minutes ahead.
- Protein powder choice matters. Whey gives the smoothest crumb. Plant proteins (pea, soy) tend to be drier and can make the cake gritty if you over-add. Use exactly one scoop, no more.
- Self-rising flour, not all-purpose. Self-rising has baking powder and salt already built in. If you only have AP, substitute: ½ cup AP + ¾ tsp baking powder + ⅛ tsp salt.
- This is a delicate cake. It doesn't transport well, doesn't hold up to heavy frostings, won't survive a 90°F day on a picnic table. Make it, eat it.
Notes to elevate
This recipe lives at the intersection of dessert and macros — fancy moves apply, but you want to keep the macro profile intact.
- Brown the protein powder. Toast the protein powder in a dry pan over low heat, stirring constantly, for 2 to 3 minutes. Adds a nutty, almost-cookie depth. Cool before using.
- Lemon zest in the meringue. ½ tsp microplaned zest brightens the whole thing and masks any protein-powder aftertaste.
- Better frosting: whipped Greek yogurt + cottage cheese. Blend ½ cup fat-free Greek yogurt with ½ cup low-fat cottage cheese until smooth in a high-powered blender. Add the pudding mix. Result: thicker, creamier, more like real frosting, still macro-friendly.
- Sugar-free Biscoff or vanilla cookie crumbs sprinkled between the layers and on the sides for textural contrast.
- Dehydrated raspberry powder dusted over the top. Tart, beautiful color, basically zero calories.
- Sugar-free ganache. Melt 2 tbsp sugar-free dark chocolate chips (Lily's) with 2 tbsp heavy cream, drizzle over top. Adds richness without significant sugar.
- Plate it like a patisserie. Slice clean wedges (refrigerate the assembled cake 30 minutes first), set on a small plate, smear of yogurt frosting on the plate, three fresh raspberries, dusting of powdered monk fruit. Restaurant plating doesn't require sugar.
- Layer thinly with fresh fruit. Sliced strawberries or raspberries between the layers, pressed into the frosting. Adds natural sweetness, color, and the celebration factor.
Gluten-free
Swap the self-rising flour for a self-rising GF blend, or build your own: ½ cup GF 1:1 flour + ¾ tsp baking powder + ⅛ tsp salt + ¼ tsp xanthan gum.
Make sure your protein powder is certified GF (most whey isolates and pea proteins are, but check labels — some have wheat-based fillers).
Differences: practically none. This cake is more about the meringue structure than the flour — GF flour blends barely affect the final texture because the eggs are doing 80% of the work.
GF vegan version
This one is genuinely tough — the recipe is built on egg whites. The whole structure depends on them. A full vegan conversion is essentially a different recipe, but here's the best route:
Egg white substitute
Aquafaba is the workable answer. ¾ cup of aquafaba (the liquid from a can of unsalted chickpeas) whips into a stable meringue. Add the cream of tartar and monk fruit sweetener and beat as you would egg whites. It takes longer to reach stiff peaks (8 to 10 minutes vs. 4 to 5) but gets there.
Protein powder
Use a plant-based vanilla protein powder. Orgain, Vega, or KOS work well.
Frosting
Greek yogurt → Kite Hill unsweetened Greek-style almond yogurt or Forager cashew Greek. Same volume. Both whip up well with the pudding mix.
Pudding mix
Standard sugar-free pudding mix (Jell-O brand) is not vegan — contains dairy. Use Simply Delish sugar-free pudding mix, which is vegan and works the same way.
Flour
GF self-rising or GF 1:1 + baking powder/salt as above.
Differences from the original: the aquafaba meringue is lighter and slightly more fragile than egg-white meringue — your cakes will be more delicate and you'll need to handle them like a soufflé. The flavor profile is identical (aquafaba is neutral once whipped). The plant-based protein powder may give a slightly grittier crumb than whey, and may leave a faint earthy note depending on the brand. Cashew-based Greek-style yogurt makes the best frosting of the plant yogurts; almond can be too thin. Honest scoring: 7.5/10 — a working version of a fundamentally egg-dependent recipe. If your friend can't eat eggs, this gets you in the ballpark.