To make Brownies: Heat oven to 350° F. Prepare brownie mix according to package instructions. Spread on greased, foil-lined, 15-by-10-by-1-inch baking pan.
Bake 15 minutes, or until toothpick inserted in center comes out almost clean. Cool in pan on wire rack.
To make Peppermint Filling: In large bowl, using electric mixer on medium speed, beat confectioners’ sugar, melted butter, cream, peppermint extract and food coloring until well blended and smooth. Spread evenly over cooled brownies. Refrigerate 30 minutes.
To make Chocolate Glaze: In large, microwavable bowl, microwave chocolate and butter on high 2 minutes, until butter is melted. Stir until chocolate is completely melted. Spread over top of chilled brownies. Sprinkle with crushed peppermint candies, if desired. Cut into bars.