4 squares BAKER'S Unsweetened Chocolate
3/4 cup butter or margarine
2 cups sugar
1 tsp. vanilla
1 cup flour
1 cup coarsely chopped walnuts (optional)
Heat oven to 350°F.
Spray pan with cooking spray.
MICROWAVE chocolate and butter in large microwaveable bowl on HIGH 2 min. or until butter is melted. Stir until chocolate is completely melted. Stir in sugar. Blend in eggs and vanilla. Add flour and nuts; mix well. Pour into prepared pan.
BAKE 30 to 35 min. or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.) Cool completely.