1 (12 ounce) package semisweet chocolate chips (2 cups)
1/2 cup butter or margarine
1 cup sugar
1 1/4 cups all-purpose flour
1 tsp. vanilla
1/2 tsp. baking powder
1/2 tsp. salt
3 eggs, beaten
1 cup chopped nuts, if desired

Heat oven to 350 degrees. Heat chocolate chips and butter in 3-quart saucepan over low heat, stirring frequently, until smooth; remove from heat. Stir in remaining ingredients except nuts. Stir in nuts. Spread batter in ungreased rectangular pan, 13 x 9 x 2 inches. Bake 25 to 30 minutes or until center is set. Cool completely. Cut into 8 rows by 4 rows.