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Recipe Drop: Vanilla Protein Sponge Cake

October 07, 2026•2 min read

I don't mean to be dramatic, but I have made this recipe for birthdays, sold it at farmers markets, and even eaten a whole one by myself in 5 days. It absolutely SLAPS every. single. time.

Oh...and did I mention it's ~120-calories and 11 grams of protein per slice?!

Here are the details:

INGREDIENTS,⁣ 𝘛𝘏𝘌 𝘊𝘈𝘒𝘌⁣

  • 1 banana⁣

  • 4 egg whites⁣

  • 1 cup sugar-free / unsweetened applesauce⁣

  • 1.5 tsp vanilla extract⁣

  • 1 cup oat flour (aka take 1.25 cups of rolled oats and bend it up into flour consistency!)⁣ see notes

  • 2 scoops of vanilla protein powder⁣ see notes

  • 1/2 tsp baking soda⁣

  • 1/2 tsp salt⁣

INGREDIENTS, ⁣𝘛𝘏𝘌 𝘍𝘙𝘖𝘚𝘛𝘐𝘕𝘎⁣

  • 1/2 cup protein powder (~2 scoops) see notes

  • 1 cup 0% fat Greek Yogurt ⁣see notes

  • 1 tsp raw cane sugar OR 1 tbsp maple syrup to taste

  • 2 tbsp milk (+ more for desired-consistency) ⁣see notes

*My brand recommendations*

  • Oats - Bob's Red Mill Protein Oats

  • Protein - Life Time BUILD whey; I have only made this recipe with Whey protein...never plant based!

  • Greek Yogurt ⁣- Fage or Siggi's

  • Milk - Fairlife, Malk, Elmhurst, VitaCoco

RECIPE ⁣

  1. preheat oven to 350. spray an 8x8 pan with avocado oil.

  2. in large bowl, mash the banana in a medium bowl.

  3. combine the rest of "the wet" ingredients in the medium bowl with the banana (egg whites, apple sauce, vanilla extract).

  4. in a small bowl combine the dry ingredients (oat flour, vanilla protein powder, baking soda, salt).

  5. pour the dry mixture into the bowl of wet mixture. mix well.⁣

  6. fold the sprinkles into the batter. pour the beautiful mixture into the (avocado spray-lined) 8x8 pan.

  7. bake for 20-22 minutes. let cool. ⁣

  8. to make the frosting, combine all ingredients in either a Magic Bullet or a small bowl. spread evenly across the cake!

MACROS ⁣

Whole Cake: 1,072 kcal / 96P / 153C / 12F

Per slice (9 slices total): 120 kcal / 11P / 17C / 1.3F

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