Prepare the brownie batter according to the directions for cake style brownies found on the box. Evenly spread the batter in a 9 x 13-inch baking pan, lined with parchment paper, waxed paper, or foil paper.

Once baked, cool brownies completely. Lift brownies out of the baking pan; then remove the waxed paper.

Tint the vanilla frosting with the yellow food coloring to the desired shade. Spread frosting evenly on top of the brownies. Cut into 1-inch by 2-inch rectangles.

Set aside 24 green, 24 yellow and 24 red M&M’S® Brand Milk or Peanut Chocolate Candies. Dot each brownie rectangle like a traffic light with one red, one yellow and one green M&M’S® Brand Milk or Peanut Chocolate Candy.