2 1/2 c. powdered sugar
1/4 c. cocoa
1/2 c. butter
4-5 tbsp. milk

In small saucepan, melt cocoa and butter together. Place powdered sugar into small mixing bowl; add melted chocolate and mix together 4 tablespoons of the milk. Consistency should be like thick molasses. Pour and spread over top of cake when cake is hot. Sprinkle with smashed M&M'S®.