Banana Fudge Walnut Brownies
["1/4 c. butter", "1 (6 oz.) pkg. semi-sweet chocolate chips", "3/4 c. flour", "1/2 c. sugar", "1/3 c. chopped walnuts", "1/3 c. mashed banana", "1/2 tsp. vanilla", "1/4 tsp. baking powder", "1/4 tsp. salt", "1 egg"]
["Heat oven to 350\u00b0.", "Grease bottom only of an 8-inch square pan.", "Melt in 2-quart saucepan over low heat stirring constantly the butter and chocolate chips.", "Beat in thoroughly with spoon the rest of the ingredients. Spread batter evenly in", "pan. Bake about 30 minutes or until center is set. Cool completely. Cut into 2-inch squares."]
["butter", "semi-sweet chocolate chips", "flour", "sugar", "walnuts", "banana", "vanilla", "baking powder", "salt", "egg"]