Double Chocolate Crumble Bars
["3/4 c. sugar", "1/2 c. butter or margarine, softened", "2 eggs", "1 tsp. vanilla", "3/4 c. all-purpose flour", "1/2 c. chopped pecans or walnuts", "2 Tbsp. unsweetened cocoa powder", "1/4 tsp. baking powder", "1/4 tsp. salt", "2 c. tiny marshmallows", "1 (6 oz.) pkg. semi-sweet chocolate pieces (1 c.)", "1 c. peanut butter", "1 1/2 c. crisp rice cereal"]
["In a large mixer bowl, cream sugar and butter or margarine together thoroughly.", "Beat in eggs and vanilla.", "Stir together flour, chopped nuts, cocoa, baking powder and salt.", "Stir into egg mixture.", "Spread in bottom of a greased 13 x 9 x 2-inch baking pan.", "Bake in a 350\u00b0 oven for 15 to 20 minutes or until cookies test done.", "Sprinkle the marshmallows evenly atop; bake 3 minutes more.", "Cool."]
["sugar", "butter", "eggs", "vanilla", "all-purpose", "pecans", "cocoa", "baking powder", "salt", "marshmallows", "semi-sweet chocolate", "peanut butter", "crisp rice cereal"]