For cupcakes:

1 c. sugar
7/8 c. flour (7/8 c. = 3/4 c. + 2 TBS)
3/8 c. cocoa (3/8 c. = 6 TBS)
3/4 tsp baking powder
3/4 tsp baking soda
1/2 tsp salt
1 egg
1/2 c. milk
1/4 c. vegetable oil
1/2 tsp vanilla extract
1/2 tsp peppermint extract
1/2 c. boiling water

For frosting

1 1/2 sticks softened, salted butter
3 c. powdered sugar
1-2 TBS heavy cream
1/2 tsp peppermint extract
1 drop green food coloring