Protein Powder Mug Cake

This high-protein mug cake is soft, fluffy, and ready in just 1 minute — made with protein powder and packed with over 24g of protein. A single-serve microwave recipe that's naturally eggless and vegan-friendly, and stays moist and cake-like every time, never dry or rubbery.

5 from 41 votes

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Prep Time 1

Cook Time 1

Total Time 2

Serving serving

Ingredients

¼ cup oat flour, spooned & leveled (I love Bob’s Red Mill)
2 tablespoon vanilla protein powder, (whey or pea protein)
½ teaspoon baking powder
1 tablespoon coconut sugar
¼ cup milk, oat, almond, or cow’s milk
½ teaspoon vanilla extract
2 tablespoon mini chocolate chips, or regular sized (optional)

Instructions

Mix the dry ingredients: In a microwave-safe ramekin or mug, mix the oat flour, protein powder, coconut sugar, and baking powder.
Add the wet ingredients: Add the milk and vanilla, then whisk until smooth with no clumps.
Stir in chocolate chips: Mix in chocolate chips if desired and sprinkle extra on top.
Microwave the mug cake: Microwave on high for 60–75 seconds. Every microwave is different, so check at the 50-second mark. If it still looks slightly liquidy, cook in 10-second intervals until done.
Serve and enjoy: Serve immediately while warm.

Notes

Protein Powder: Use a protein powder you enjoy — I use Kono Nutrition vanilla whey, which bakes soft and fluffy. Most whey and plant-based (pea, brown rice, soy, or blends) protein powders work well. Avoid collagen and beef protein — they don't have the structure to bake into a cake and will turn out gummy and flat.

Oat Flour: If you don't have oat flour, blend rolled oats into a fine flour in a blender. Don't substitute almond or coconut flour — they'll change the texture. Measure by spooning into the cup and leveling off; scooping directly packs in too much and the cake comes out dry.

Microwave Times: Start checking at 50 seconds. If the center still looks wet, continue in 10-second intervals until just set. A little softness in the middle is fine — it firms up as it cools. Every extra 10 seconds past 75 turns it rubbery.

Batter Consistency: Different protein powders absorb liquid differently. If the batter looks too thick after mixing, add milk 1 teaspoon at a time until it looks like pancake batter.

Texture Tip: Don't overmix — whisk just until the batter is smooth and no clumps remain. Overmixing makes the cake dense.

Mug Size: Use an 8–12 oz mug or ramekin. The batter rises as it cooks, and a smaller mug will overflow in the microwave.

Serving Size: This recipe makes one mug cake. For best results, make separate mug cakes instead of doubling the batter in one larger mug — it cooks unevenly.

Best Eaten Fresh: This mug cake is best within 2–3 minutes of coming out of the microwave. The texture isn't the same reheated.

Nutrition

Course Breakfast, Dessert, Snack

Cuisine American, Healthy

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