3/4 c. butter, softened
1 c. sugar
1 c. brown sugar
1 tsp. vanilla
3 eggs
2 1/2 c. flour
2 1/2 tsp. baking powder
1/4 tsp. salt
1/3 c. unsweetened cocoa
1 tbsp. butter, melted
3/4 c. M&M'S® plain

Beat softened butter and sugars until fluffy; beat in vanilla and eggs. Stir in 2 1/4 cups flour mixed with baking powder and salt, mixing well. Divide batter in half. Into half of the batter, stir in cocoa and melted butter. Spread into greased 13 x 9 inch pan.

Into remaining batter, stir in remaining flour; fold in 1/2 cup plain candies. Spread evenly over chocolate layer. Bake at 350 degrees for 20 minutes. Sprinkle with remaining candies; pressing in slightly. Bake an additional 15 minutes or until edges are lightly browned. Remove to wire rack to cool.