For those times when you only want just a little bit. Funfetti Cake in A Mug with buttercream frosting
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5 from 3 votes

Funfetti Cake In A Mug

Sometimes you really want cake but you really don't need to make a whole cake.  It happens to everyone.  Make a Funfetti Cake In a Mug for a treat for one.
Prep Time5 mins
Cook Time1 min
Total Time6 mins
Course: Dessert
Cuisine: American
Servings: 1 serving
Calories: 567kcal
Author: Jade Jones


For the cake:

  • 3 Tbsp yellow cake mix or you can use white
  • 2 Tbsp water
  • 1/2 tsp oil
  • 1 Tbsp Rainbow sprinkles

For the frosting:

  • 2 Tbsp butter
  • 1/4 cup powdered sugar
  • Dash vanilla
  • Pinch salt
  • 1/4 tsp milk if needed
  • 1/2 Tbsp Sprinkles


  • Mix together cake ingredients in a mug. Microwave for 45-60 seconds depending on your microwave. Check your cake with a toothpick to see if it's done.
  • While the cake cools, make your frosting. If your butter is cold microwave it for 5 seconds. Whip it really well with a fork. When whipped add powdered sugar and whip until incorporated. Add vanilla, salt, and if needed milk. Mix again. Spoon over cooled (or at least mostly cooled) cake.
  • Top with sprinkles.


Calories: 567kcal | Carbohydrates: 80g | Protein: 1g | Fat: 27g | Saturated Fat: 16g | Cholesterol: 61mg | Sodium: 528mg | Sugar: 62g | Vitamin A: 710IU | Calcium: 94mg | Iron: 0.9mg