Watermelon Cupcakes! Bright green cupcakes with buttercream that tastes like watermelon! Add mini chocolate chips for the watermelon seeds!

Kool aid has just revolutionized my buttercream.

You can take any flavor of powdered kool aid and add it to buttercream and voila – buttercream that tastes like watermelon, mango, pink lemonade, kiwi-lime! The flavors seem endless!

Plus it’s such a fun way to jazz up cupcakes for a birthday party – no longer an easy decision between vanilla or chocolate frosting.. and sometimes that’s not even easy 🙂

Making Watermelon Cupcakes

For the base of the cupcake, I used our favorite homemade white cake recipe and added leaf green food coloring from Wilton until I got the desired color.

To make things easier, use a box of white cake mix! Gasp! Yes I said it.

If kids are the primarily people who are going to be eating these cupcakes, we all know that they are more into the frosting than the cake, so if it saves you some time, use a box!

Our recipe will make 10-12 cupcakes (depending on how full you fill the muffin pan) and a box mix will probably make 20-24 cupcakes.

We got our super bright green cupcake liners at Party City – they really seem to match the Watermelon Cupcakes perfectly!

Buttercream Frosting

For the buttercream you’ll need 2 sticks of room temperature butter (I use unsalted), 1/2 cup vegetable shortening (this helps with stability, but you can substitute butter if you prefer), 3-4 cups of powdered sugar, 3/4 tsp of powdered watermelon kool aid, and red food coloring.

The watermelon kool aid actually doesn’t add much color to the buttercream (adds a lot of flavor though!) so you’ll need some red food coloring to help create a watermelon pink color.

I used the no taste red gel food coloring from Wilton, adding a little at a time, but it actually takes a lot to even just get the buttercream this color. I have not tried using pink food coloring so I don’t know if it would create the same color.

Don’t forget to add the mini chocolate chips! They complete the look of these Watermelon Cupcakes!


Cupcakes – makes 10-12 cupcakes

  • 6 tbsp butter, softened
  • 2/3 cup sugar
  • 3 egg whites
  • 1/2 cup sour cream
  • 1 tsp vanilla extract
  • 1 cup + 2 tbsp all purpose flour
  • 1 & 1/2 tsp baking powder
  • 1/4 tsp salt
  • leaf green food coloring by wilton (or similar light green food coloring)


  • 2 sticks of butter, unsalted at room temperature
  • 1/2 cup vegetable shortening
  • 3-4 cups powdered sugar
  • 3/4 tsp of powdered watermelon koolaid mix
  • small about of red food coloring, to give the buttercream a pinkish color
  • mini chocolate chips



  1. Preheat the oven to 375º F. Place cupcakes liners to muffin pan.
  2. In a mixing bowl, combine the butter and sugar, beat using an electric mixer until fluffy. Add in the egg whites, beat again.
  3. Add in the sour cream and vanilla extract, mix by hand with spatula.
  4. In a smaller bowl, combine the flour, baking powder and salt, gently mix with a spoon.
  5. Gradually add half of the flour mixture to the wet ingredients, do not dump it in, rather take spoonfuls of the flour mixture and gently shake it over the wet ingredients, as if you were sifting in the flour. Fold in the mixture until no flour remains. Repeat with the other half of the flour, folding it in and scraping the sides and bottom of the bowl to incorporate everything.
  6. Add in the green food coloring, mix to incorporate.
  7. Divide the batter among the cupcake liners, filling each 1/2 full.
  8. Bake at 375º F for 5 minutes, then reduce heat to 350º will keeping the cupcakes in the oven and bake for 8-10 minutes or until a toothpick comes out clean when inserted into the center of a cupcake.
  9. Allow the cupcakes to cool before adding the buttercream.


  1. In a mixing bowl beat the butter and vegetable shortening with an electric mixer until smooth, about 2 minutes.
  2. Add in 2 cups of powdered sugar, mix by hand with a spatula.
  3. Add in more powdered sugar as you see fit, up to 2 more cups, mixing first by hand then with an electric mixer.
    Add in the watermelon kool aid powder and a small amount of red food coloring (to give
  4. the frosting a pinkish color), mixing one last time with an electric mixer.

How to assemble

  1. Place the buttercream in a large piping bag fit with a 1m wilton piping tip. Push the buttercream down into the bag. Pipe the buttercream onto the cupcakes, starting in the center of the cupcake, swirling out, and then swirling back into the center, progressively stacking the frosting as you get to the center.
  2. Add mini chocolate chips on top of the buttercream.