Last updated 3/2/2021 at 1:23pm
1/2 cup butter or margarine (1 stick), cut up
4 ounces unsweetened chocolate, broken into pieces
2 ounces semisweet chocolate, broken into pieces
1 1/2 cups sugar
1 tablespoon vanilla extract
3 large eggs, lightly beaten
1 cup all-purpose flour
1 cup walnuts, coarsely chopped (optional)
1. Preheat oven to 350 F. Grease 9-by-9-inch metal baking pan; line with foil, extending foil above edge on 2 sides. Grease foil.
2. In 3-quart saucepan, heat butter and chocolates over medium-low heat until melted, stirring frequently. Remove saucepan from heat; stir in sugar and vanilla. Add eggs; st...