Ingredients
½cupsalted butter
¾cupgranulated sugar
1large egg
1egg yolk
1½cupall purpose flour
1tbspcornstarch
1tspbaking powder
½tspbaking soda
¼tspsalt
¾cupm&m’s
¼cupmini m&m’s
4tbspbutter
3½tbspcocoa powder
1½cupspowdered sugar
½tspvanilla
1tbspmilk
M&M’s
sprinkles
Preparation
Preheat oven to 350 degrees F and grease a 9-inch pie dish.
Beat butter for 2 minutes until smooth. Mix in sugar until fluffy. Add in the egg, yolk, and vanilla until smooth, creamy, and light in color.
Add the flour, cornstarch, baking powder, baking soda, and salt and mix until combined.
Mix in the m&m’s by hand until evenly distributed.
Spread dough in the greased pie dish. Bake for 23 to 26 minutes. Cool completely before removing from pie dish and frosting.
Beat butter and cocoa powder together. Mix in the powdered sugar and vanilla. Add the milk as needed to get desired consistency.
Place frosting in a piping bag with an M1 tip and decorate the cookie cake. Immediately add the M&M’s and sprinkles.