Family Tested & Approved
6-8 slices it's according how you slice it
plus 1 tablespoon all purpose flour
butter, softened to room temperature
In a large mixing bowl, cream together butter add brown sugar. Add in egg and vanilla and mix well.
In a separate bowl, combine flour and baking soda. A dd flour mixture to your large mixing bowl and mix until completely incorporated. Fold in m&m's.
Pour and spread batter into a greased 9 1/2 inch pie pan and bake for 25-30 minutes, or until a toothpick comes out clean.
Let cool and cut into slices.