Baker's One Bowl Brownies

4 squares BAKER'S Unsweetened Baking Chocolate
3/4 cup (1-1/2 sticks) butter or margarine
2 cups sugar
3 eggs
1 tsp. vanilla
1 cup flour
1 cup coarsely chopped PLANTERS Pecans

PREHEAT oven to 350°F. Line 13x9-inch baking pan with foil, with ends of foil extending over sides of pan. Grease foil.
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 pecans; mix well. Spread into prepared pan.
BAKE 30 to 35 min. or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.) Cool in pan on wire rack. Remove brownies from pan, using foil handles. Cut into 24 squares. Store in tightly covered container at room temperature.