Chocolate Rice Krispie Bars
["1/2 c. butter", "2 eggs", "3/4 c. flour", "1/4 tsp. salt", "3/4 c. sugar", "1 tsp. vanilla", "1/4 tsp. baking powder", "1/2 c. chopped walnuts", "2 1/2 c. mini marshmallows"]
["Cream the butter and sugar together. Add eggs and vanilla. Add flour, baking powder and salt all sifted together.", "Spread in a 13 x 9 x 2-inch greased pan. Bake 15 to 20 minutes at 350\u00b0. Remove and place marshmallows over cake, then cool, for 30 minutes. Add topping."]
["butter", "eggs", "flour", "salt", "sugar", "vanilla", "baking powder", "walnuts", "marshmallows"]