1. Preheat oven to 350

Line 9 by 13 inch pan with aluminum foil and non stick spray.

In large bowl, combine cake mix, eggs, and butter until smooth.

Stir in M&M's.

Put batter in pan

Bake 15-20 minutes or until light golden on edges. Center might be a little under done. That's ok.

Let cool before digging in.