Preheat the oven to 350 F. Line muffin pan with cupcake liners (half green, half pink).

In a small bowl, combine the flour, baking powder, and salt. Set aside.

In a medium bowl, beat the butter and sugar together until light and fluffy, about 2-3 minutes.

Add in the egg, egg white, and vanilla; beat until blended.

On low speed, gradually beat in the flour mixture, one third at a time, alternating with milk, beginning and ending with flour.

Divide the batter among the liners and bake for 18-20 minutes or until a toothpick inserted in the center comes out clean. Cool the cupcakes for 10 minutes in the pan. Transfer to a wire rack to cool completely.

In a medium bowl, beat the butter and vanilla until smooth and creamy.

Add the powdered sugar and milk and beat until combined.

Beat on high speed until fluffy.

Divide the frosting in half. Add a few drops of pink gel food coloring to one half and a few drops of green and yellow food coloring to the other half. Stir until combined.

Transfer the pink frosting to a piping bag fitted with a large star tip.

Pipe a swirl of pink buttercream on the tops of half of the cupcakes. Place three plain mentos along the bottom edge to make Miss Piggy’s necklace.

Use an black food safe marker to draw pupils on the 12 of the mentos candies.

Use an offset spatula to frost the tops of the remaining cupcakes with green frosting.

Place two eye mentos sticking up on top of the cupcake to make Kermit’s eyes.