Step 1

Preheat oven to 350 degrees F. Line a 9 x 13 inch baking pan with parchment paper and spray with non-stick spray.

Step 2

Pour cake mix, eggs and butter in a large bowl. Stir until combined.

Step 3

Stir in M&M's.

Step 4

Spread batter in prepared baking pan. Use a spatula or hands to press down.

Step 5

Bake for 20-25 minutes. The edges should start to turn golden brown. Cool before cutting.