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–+ servings
A glass bowl containing a Chocolate Protein Mug Cake topped with melted peanut butter and chocolate chips, with a spoon scooping some out.

Chocolate Protein Mug Cake Recipe

Bethany Galloway
Ready in under a minute, this chocolate protein mug cake is rich, gooey, and hits that deep cocoa craving without derailing your day. It’s a high-protein dessert built for real life - when you want something sweet, but still care about carbs, macros, and keeping it gluten-free. No baking trays, no preheating, no cleanup. Just a microwave-safe mug, a scoop of chocolate protein powder, and a few simple ingredients standing between you and a warm, satisfying treat.
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Prep Time 1 minute
Cook Time 1 minute
Total Time 2 minutes
Course Dessert
Servings 1 Serving
Calories 255
Protein 38

Ingredients

  • 1 large egg - pasteurized
  • 1/4 cup filtered milk - e.g. fairlife, arla bob, or another protein milk
  • 1/2 teaspoon liquid stevia - or sweetener of choice
  • 1/4 teaspoon vanilla extract - optional
  • 1.5 tablespoons unsweetened cocoa powder
  • 1 scoop whey protein powder - chocolate flavor is ideal, vanilla, caramel, cookies and cream work too
  • 1/4 teaspoon baking powder
  • pinch instant coffee - optional
  • pinch salt - optional
  • chocolate chips - optional garnish

Peanut sauce (optional)

  • 1 tablespoon powdered peanut butter - e.g. PB2, PBFit
  • 1 tablespoon water - plus a little more, until preferred consistency

Instructions

  • Add the egg, milk, liquid stevia (or other sweetener if liquid), and vanilla to a mug and whisk with a fork until the egg is incorporated.
    1 large egg, 1/4 cup filtered milk, 1/2 teaspoon liquid stevia, 1/4 teaspoon vanilla extract
  • Add the dry ingredients and mix until just combined.
    1.5 tablespoons unsweetened cocoa powder, 1 scoop whey protein powder, 1/4 teaspoon baking powder, pinch instant coffee, pinch salt
  • Microwave for 30 seconds and then check in 10 second intervals until the cake is just set. For me, this was around the 50 second mark. The cake will be a little gooey still.

Peanut sauce

  • In a small bowl, mix the powdered peanut butter and water together.
    1 tablespoon powdered peanut butter, 1 tablespoon water
  • Add a little more water, 1 teaspoon at a time until it reaches your desired consistency.
  • Drizzle over the mug cake, add chocolate chips if desired, and enjoy!
    chocolate chips

Notes

  • Microwave wattage matters: Every microwave is different. Start low and check often to avoid overcooking.
  • Use a big mug: Go for at least a 10-12 oz mug so the batter has room to rise without spilling over.
  • Don’t overmix: Stir just until combined - overmixing can make the texture rubbery.
  • Watch the time: It’s better slightly undercooked than overdone. Mug cakes firm up as they cool.
  • Add toppings after cooking: Chocolate chips or peanut sauce melt best when added after microwaving.
  • Let it rest: Give it a minute before digging in. It sets a little more and won’t burn your tongue.

 

Storage instructions

  • Best fresh: This mug cake is meant to be eaten warm, straight from the mug.
  • Fridge option: If you need to save it, cover and refrigerate for up to 1 day.
  • Reheat gently: Microwave for 10-15 seconds to warm it back up - don’t overdo it or it’ll dry out.
  • Not freezer-friendly: The texture doesn’t hold up well once frozen and thawed.

Nutritional Information

Calories: 255kcal | Carbohydrates: 13g | Protein: 38g | Fat: 9g | Saturated Fat: 3g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Trans Fat: 0.02g | Cholesterol: 237mg | Sodium: 301mg | Potassium: 375mg | Fiber: 4g | Sugar: 5g | Vitamin A: 405IU | Calcium: 295mg | Iron: 4mg