HEAT oven to 350°F (325°F for glass baking dish). 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 and walnuts until well blended. Spread batter in prepared pan.
BAKE 30 to 35 minutes or until toothpick inserted in center comes out with fudgy crumbs. DO NOT OVERBAKE. Cool in pan. Run knife around edge of pan to loosen brownies from sides. Lift from pan, using foil as handles, onto cutting board. Use 2-inch heart-shaped cookie cutter to cut out brownies. Decorate with vanilla frosting, melted BAKER'S White Chocolate, decorating gels and assorted candies or sprinkles.
Size It Up: Looking for a special treat? One brownie is all that is needed to provide a lot of chocolate flavor.