Cream 3/4 cup butter and sugars until light and fluffy; beat in eggs and vanilla. Add 2 1/2 cup flour, baking powder and salt. Divide batter in half. Blend together baking cocoa and 1 Tbsp. melted butter; stir into half of the dough. Spread cocoa dough evenly into greased 9x13 inch baking pan. Stir remaining 1/4 cup flour and 1/2 cup M&M's into remaining dough. Spread evenly over cocoa dough in pan. Sprinkle with remaining 1/2 cup M&M's. Bake at 350 degrees F for 25-30 minutes or until edges start to pull away from sides of pan.
By Robin from Washington, IA
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