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Coffee Cake Mug Cake

Single-serve coffee cake mug cake with vanilla protein powder in the batter, a layered cinnamon brown sugar streusel in the middle and on top, and a sweet glaze drizzle. One mug, 60 seconds, soft center.
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Prep Time 4 minutes
Cook Time 1 minute
Total Time 5 minutes
SERVINGS: 1 serving

Ingredients

For the mug cake:

  • 3 tbsp all-purpose flour
  • 1 tbsp vanilla protein powder
  • 1/4 tsp baking powder
  • 1 tbsp brown sugar
  • Pinch of salt
  • 3 tbsp milk
  • 1 tbsp butter melted
  • 1/4 tsp vanilla extract

For the streusel:

  • 1 tbsp brown sugar
  • 1/2 tsp cinnamon
  • 1 tsp all-purpose flour
  • 1/2 tbsp butter melted
  • Pinch of salt

For the glaze (highly recommended):

  • 2 tbsp powdered sugar
  • 1 to 2 tsp milk

Instructions

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  • In a microwave-safe mug (at least 10 to 12 oz) add flour, protein powder, baking powder, brown sugar, and salt. Stir to combine.
  • Add milk, melted butter, and vanilla. Stir until completely smooth with no flour pockets.
  • In a small bowl mix brown sugar, cinnamon, flour, melted butter, and salt with a fork until crumbly. It should hold together when pressed but break apart easily.
  • Add half the batter to the mug. Sprinkle half the streusel over the batter. Pour the remaining batter on top. Finish with the remaining streusel.
  • Microwave on high for 45 seconds. Check. The top should look mostly set but still slightly soft in the center. Add 10-second increments as needed. Total time is usually 60 to 70 seconds. Do not overcook. Slightly underdone is the goal.
  • Let rest 60 seconds. Whisk glaze ingredients until smooth and drizzle over the top while still warm. Eat immediately.

Notes

Best eaten immediately. If storing, cover and keep at room temperature for up to 24 hours. Microwave 15 seconds to rewarm.
Slightly undercook it. The cake firms up from residual heat after it comes out. Pulling it when the center still looks barely set gives you a soft, gooey interior instead of a dry, rubbery one.
The streusel must be crumbly, not wet. If yours looks greasy or paste-like, add a pinch more flour. Wet streusel sinks into the batter and disappears.
Use a mug that is at least 10 to 12 oz. Smaller mugs will overflow.
No protein powder? Leave it out and add 1 extra tsp of flour to keep the ratio right.
Oven method: Pour into an oven-safe ramekin and bake at 350°F for 12 to 15 minutes until a toothpick comes out mostly clean.

Nutrition

Serving: 1 | Calories: 497kcal | Carbohydrates: 64g | Protein: 16g | Fat: 21g | Saturated Fat: 14g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 1g | Cholesterol: 68mg | Sodium: 359mg | Potassium: 326mg | Fiber: 2g | Sugar: 43g | Vitamin A: 570IU | Vitamin C: 0.04mg | Calcium: 327mg | Iron: 3mg