M&M Shortbread

1/2 C. powered sugar
1 C. butter, soft
2 C. flour
1/2 C. M&M's to make this M&M shortbread

Preheat oven to 350ºF.  Beat together the butter and powdered sugar.  Slowly add the flour (about a half cup at a time), mixing a bit in between each addition.  The mixture will look crumbly at first, but the dough will come together after a few minutes.This dough should not be sticky.  Gently mix in the M&M's with a spatula or wooden spoon. Turn dough onto a lightly floured silicone baking mat or parchment paper and roll out to a 1/4" thick rectangle. Using the parchment or baking mat, life the dough onto a baking sheet (leave the parchment or silicone mat as the lining). Cut dough into 24 squares with cookie cutter set you got for Christmas last year. Bake for 20-25 minutes until edges begin to turn a light golden brown. Let cool completely. on a wire rack. Drizzle the melting candy over top and sprinkle with additional M&M's if desired.