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Funfetti Cupcakes with Marshmallow Buttercream

Yield: 18 cupcakes
Prep Time: 30 mins
Cook Time: 15 mins
Total Time: 45 mins
You're never too old for some sprinkle cupcakes. These are super fluffy, filled with plenty of sprinkles, and topped with the creamiest marshmallow buttercream. They are the absolute best for birthday parties or just for fun!


Funfetti Cupcakes

  • 1 3/4 cup all-purpose flour
  • 3/4 tsp baking powder
  • 3/4 tsp salt
  • 1/4 cup sour cream (or plain Greek yogurt)
  • 1/2 cup + 2 Tbs. whole milk
  • 1/2 cup unsalted butter, softened
  • 1 cup sugar
  • 1 tbsp imitation vanilla extract
  • 2 eggs, room-temperature
  • 1/4 cup canola oil (or vegetable oil)
  • 1/2 cup rainbow sprinkles

Marshmallow Buttercream

  • 7 oz jar of marshmallow fluff
  • 1 cup unsalted butter, softened
  • 2 tsp imitation vanilla extract
  • 3 cup powdered sugar
  • Pinch salt
  • 2 tbsp whole milk


  • *This recipe is for high altitude. Please refer to the recipe notes for sea level instructions*. Preheat the oven to 375° F. Line two cupcake tins with 18 liners. Whisk together the flour, baking powder, and salt in a small bowl and set aside. In a liquid measuring cup, mix together the whole milk with the sour cream (or Greek yogurt) and set aside. Then, mix the sprinkles with a few pinches of flour in a small bowl until they are lightly coated.
  • Using a mixer, cream the butter and sugar on medium-high until light and fluffy, about 4 minutes. Add the eggs one at a time until incorporated. Then, mix in the imitation vanilla extract and oil.
  • Reduce the mixer to low, and add half the flour mixture followed by half the milk mixture until just combined. Repeat with remaining flour and milk mixtures. Do not overmix. Gently stir in the sprinkles until evenly combined. Divide the batter evenly between the cupcake liners.
  • Bake for 14-16 minutes, or until the cupcakes are just baked and when a toothpick inserted into the center of the cakes has a few crumbs on it. Let the cupcakes cool for a few minutes in the pan, and then completely cool on a wire rack.

Marshmallow Buttercream

  • In a medium bowl, mix together the butter and marshmallow fluff until creamy. Add the powdered sugar, one cup at a time, until thoroughly mixed. Add the imitation vanilla extract, 2 Tbs. of milk, and a pinch of salt and mix on medium-high until whipped, about 5 minutes. Add more milk or powdered sugar, 1 Tbs. at a time, until you reach your desired consistency (if necessary).


  • Pipe the frosting onto the cooled cupcakes. Decorate with sprinkles or other confections as desired. Store leftovers in an airtight container for up to 3 days. Enjoy!


**This recipe is for a high-altitude cake (about 5,000 ft.), but if you live at sea-level, you can try 1 1/2 tsp. of baking powder and only 1/2 c. milk. Bake the cakes at 350° for 18-22 minutes.**
Cuisine: American
Course: Dessert
Serving: 1cupcake, Calories: 338kcal, Carbohydrates: 50.5g, Protein: 2.4g, Fat: 14.9g, Saturated Fat: 7.5g, Cholesterol: 48mg, Sodium: 191mg, Potassium: 65mg, Fiber: 0.3g, Sugar: 39.1g
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