Prize Brownies
["1/2 c. butter or margarine", "1 c. granulated sugar", "1 tsp. vanilla", "2 eggs", "1 (1 oz.) sq. unsweetened chocolate, melted*", "1/2 c. sifted all-purpose flour (not self-rising)", "1/2 c. chopped California walnuts or whole unmelted chocolate chips"]
["*Can use cocoa. Use 3 tablespoons cocoa plus 1 tablespoon oil for each ounce can be substituted."]
["butter", "sugar", "vanilla", "eggs", "unsweetened chocolate", "flour", "California walnuts"]