A warm, rich, deeply chocolatey brownie *in a mug* in 90 seconds! This protein mug cake is the recipe I turn to every single time I want something sweet but don’t want to wait, bake, or really work too hard. It’s made with just 5 simple ingredients, packs a serious protein boost, and tastes truly indulgent – even though it’s completely healthy, gluten-free, and refined sugar-free!
What makes this one different from other protein mug cake recipes? Two things: Greek yogurt and cocoa powder. The Greek yogurt makes the cake incredibly moist and fudgy – no dry, chalky protein cake here. The cocoa powder doubles down on the chocolate flavor for a true brownie experience. If you like my Single Serve Protein Cookie or my 4-Ingredient Protein Brownies, then you’re going to LOVE this one!
Why You’ll Love This Protein Mug Cake
- Ready in just 90 seconds. 90 seconds in the microwave and you’ve got a warm, freshly baked brownie. It doesn’t get faster than that. (No microwave? Bake it at 350°F for 25 minutes — equally delicious!)
- High in protein. With both Greek yogurt and chocolate protein powder in the batter, this mug cake delivers a genuinely impressive amount of protein per serving — no sad, barely-there protein content here.
- Gluten-free and healthy. No flour, no butter, no refined sugar — just clean, wholesome ingredients that come together in the most satisfying single-serve dessert.
- Perfectly moist and fudgy. The Greek yogurt is the secret weapon here. It keeps this mug cake soft, rich, and brownie-like — not dry, not rubbery, not chalky. Just perfect.
- 5 ingredients, one bowl. Mix it all in the mug you’re going to eat it from and call it a day. Minimal cleanup, maximum satisfaction.
Frequently Asked Questions
How much protein does this protein mug cake have?
This mug cake contains approximately 28–36 grams of protein per serving, depending on the brand of protein powder you use. The protein comes from two sources: the chocolate protein powder (typically 20–30g per scoop) and the Greek yogurt (approximately 6g per ¼ cup). That’s more protein than most store-bought protein bars — in something that tastes like a warm brownie!
What protein powder did you use?
I used Be Well By Kelly Chocolate Protein Powder, and it’s genuinely my favorite for baking. It has a delicious, natural chocolate flavor that makes this mug cake taste like the real thing — not like a protein shake. It also bakes up moist and soft, not dry or rubbery. That said, any chocolate protein powder you love will work in this recipe! Just keep in mind that different brands absorb liquid differently, so your batter consistency may vary slightly.
Can I make this dairy-free?
Yes! Swap the Greek yogurt for a thick, plain dairy-free yogurt — coconut yogurt or a thick oat milk yogurt both work great. The texture may be very slightly different depending on which dairy-free yogurt you use, but it will still be delicious. Make sure your protein powder is also dairy-free (most plant-based protein powders are) and you’re all set.
Sam’s Recipe Tips
- Stir it VERY well. I mean it – stir until there are zero dry spots, NO lumps, and the batter looks completely smooth and uniform. Protein powder and cocoa powder can be stubborn and clump together, and any unincorporated pockets will result in a dry, uneven texture once cooked. Take the extra 30 seconds to really mix it thoroughly – it makes a huge difference!
- Don’t overcook it. The number one mistake with mug cakes is overcooking. Start at 90 seconds and check it – the edges should look set, but the center can look slightly underdone. It will continue to cook and firm up as it rests. Every microwave is different, so if yours runs hot, start checking at 75 seconds.
- Let it rest before eating. Give it a full minute to rest after microwaving. Not only will it be dangerously hot straight out of the microwave, but resting allows the center to finish setting into that perfect fudgy brownie texture.
- Use a large mug. Make sure your mug is at least 12 ounces – the batter will bubble and rise as it cooks. A mug that’s too small can overflow in the microwave. A wide, short mug or a ramekin gives the most even cooking.
- Top it generously. A drizzle of peanut butter, a dollop of Greek yogurt, or a handful of chocolate chips on top takes this from great to absolutely incredible. Don’t skip the toppings!
- Oven method tip: If baking in the oven, use a greased 6-ounce ramekin and bake at 350°F for 25 minutes. The result is slightly more cake-like and less fudgy than the microwave version – equally delicious, just a different texture.
5-Ingredient Protein Brownie Mug Cake
Equipment
- 1 microwave-safe mug
Ingredients
- 1/4 cup Greek yogurt or blended cottage cheese
- 1 egg
- 1/4 cup chocolate protein powder I used Be Well By Kelly Chocolate Protein Powder
- 1 tablespoon cocoa powder
- 1 tablespoon maple syrup
Instructions
- Add all ingredients to a large microwave-safe mug and stir VERY well until completely smooth with no lumps or dry spots.
- Microwave: Cook on high for 90 seconds. Let rest 1 minute before eating.
- Oven: Pour into a greased ramekin and bake at 350°F for 25 minutes.
- Top with peanut butter, Greek yogurt, chocolate chips, or your favorite toppings. Enjoy immediately!
