Rainbow Cupcakes with Vanilla Buttercream
Prep time
Cook time
Total time
These fun and vibrant rainbow cupcakes with vanilla buttercream are sure to brighten up any day! Easy to make and perfect for St. Patrick's Day!
Yield: 12
  • ½ c. all-purpose flour
  • 1 c. cake flour
  • 1 c. sugar
  • ½ c. (1 stick) butter, room temperature
  • 2 eggs
  • ¼ c. milk
  • ¼ c. sour cream
  • 1½ tsp. baking powder
  • ¼ tsp. salt
  • 1 tsp. vanilla extract
  • Food coloring
  • Vanilla Buttercream:
  • 2 c. powdered sugar
  • ½ c. (1 stick) butter, room temperature
  • 2 tbsp. heavy cream
  • pinch of salt
  • 1 tsp. vanilla extract
  1. Preheat oven to 350 degrees. Line one standard size muffin tin with cupcake liners, set aside.
  2. In the bowl of a stand mixer, cream butter and sugar until light and fluffy, about 2 minutes. Add vanilla, then eggs one at a time until incorporated.
  3. In a small mixing bowl whisk together flours, baking powder and salt. With mixing speed on low alternate adding dry ingredients and wet ingredients (milk and sour cream). Mix until no flour pockets remain.
  4. Remove bowl from stand and evenly divide the batter between six bowls. Color each bowl as desired (I used six colors: red, orange, yellow, green, blue, purple) and then place a layer of each into every cupcake liner. The batter should fill each about ⅔ of the way full.
  5. Place in oven and bake for 18-22 minutes or until the edges become lightly golden in color and the tops spring back. Be careful not to over bake! They will look slightly moist in the center. Remove from oven and allow to cool in pan for 3 minutes before transferring to a wire rack to cool completely.
  6. While cupcakes are cooling, to prepare the vanilla buttercream, in the bowl of a stand mixer fitted with the whisk attachment, beat butter until smooth, about 1 minute. With mixing speed on low, add vanilla, salt and powdered sugar. The mixture will look clumpy, that's ok. Add the heavy cream and gradually increase mixing speed to high. Beat for 2-3 minutes or until the frosting is light and fluffy. Remove and pipe (or spread) onto cooled cupcakes. Top with desired sprinkles.
-A standard box cake mix can be used in place of the vanilla cupcake recipe. It will make 24 cupcakes which means you will need to double the buttercream recipe.
-I used six colors but you can use as many as you'd like. Just divide the batter evenly between however many bowls (colors) you want.

Recipe Source: adapted from Back in the Day Bakery, Old Fashioned Cupcakes
Recipe by Life Made Simple at https://lifemadesimplebakes.com/rainbow-cupcakes-with-vanilla-buttercream/