Preheat oven to 350.
Line 9X9 Baking Pan with Parchment Paper, leaving enough of an overhang to be able to lift everything out once they are cooled.
Line Bottom of Pan with Graham Crackers
In a small pan melt butter and brown sugar over medium heat, stirring constantly.
After mixture is boiling and becomes smooth remove from heat.
Pour mixture over graham crackers.
Bake for 5 minutes.
Remove from oven.
Coat with marshmallows.
Return pan to oven and allow marshmallows to soften.
Remove from oven and add M&M's. Return to the oven and watch carefully so that the marshmallows do not burn. Remove as soon as marshmallows begin to brown.
Cool completely and then and remove from pan (use the parchment paper to simply lift it out of the pan).
Cut or break in to pieces and serve