INGREDIENTS
1/2 cup
salted butter
3/4 cup
granulated sugar
1 large
egg
1
egg yolk
1 1/2 cups
flour
1 tbsp
cornstarch
1 tsp
baking powder
1/2 tsp
baking soda
1/4 tsp
salt
3/4 cup
m&m's
1/4 cup
m&m's
4 tbsps
butter
3 1/2 tbsps
cocoa powder
1 1/2 cups
powdered sugar
1/2 tsp
vanilla
1 tbsp
milk
1 serving
m&m's
1 serving
sprinkles