LINE 13x9-inch baking pan with foil extending over edges to form handles. Grease foil.
MICROWAVE chocolate and butter in large microwavable bowl on HIGH 2 minutes or until butter is melted. Stir until chocolate is completely melted. Stir sugar into chocolate mixture until well blended. Mix in eggs and vanilla. Stir in flour until well blended. Spread in prepared pan.
BAKE at 350°F (325°F for glass baking dish) for 30 to 35 minutes or until toothpick inserted in center comes out with fudgy crumbs. DO NOT OVERBAKE. Cool in pan. Lift out of pan onto cutting board. Cut into star and round shapes using cookie cutters. Decorate cut-outs to resemble snowflakes with melted BAKER'S Premium White Baking Chocolate Squares.