01 -
In a medium bowl, whisk together the all-purpose flour, baking powder, and salt until evenly blended to prevent clumping and ensure tenderness.
02 -
Using a stand or handheld mixer, beat the softened butter and granulated sugar on medium speed for 3 to 4 minutes until pale and fluffy, scraping down the sides as needed.
03 -
Add egg whites one at a time, mixing well after each addition, then blend in Greek yogurt, whole milk, and vanilla extract on low speed until just combined.
04 -
Gradually mix in green gel food coloring until achieving a vibrant watermelon rind shade, cautious not to overcolor.
05 -
Fold the flour mixture into the wet ingredients in two additions, mixing gently on low speed to maintain a fluffy texture without over-mixing.
06 -
Preheat the oven to 350°F. Line a muffin tin with cupcake liners and fill each liner two-thirds full with batter.
07 -
Bake for 16 to 19 minutes, or until a toothpick inserted in the center comes out clean. Allow cupcakes to cool completely before frosting.
08 -
Beat room-temperature butter until smooth and creamy, about 2 to 3 minutes. Gradually add powdered sugar and continue beating until thick and fluffy.
09 -
Mix in watermelon Kool-Aid powder and pink gel food coloring until the desired watermelon pink hue is achieved. Add milk as necessary to reach spreadable consistency.
10 -
Generously pipe or spread the watermelon frosting atop cooled cupcakes. Optionally, garnish with mini chocolate chips to resemble watermelon seeds.