Walnut-Topped Brownies

Delicious moist brownies topped with crunchy walnuts; the perfect combination! BROWNIE BASE 3/4 cup butter or margarine, cubed 4 (1 oz each) squares unsweetened chocolate 4 eggs 2 cups sugar 1-1/4 teaspoons vanilla 1 cup all-purpose flour WALNUT TOPPING 3/4 cup packed...