Chocolate Surprise Bars

1/2 butter or margarine 3/4 cup sugar 1/4 teaspoon salt 3/4 cup all-purpose flour 2 eggs 1 teaspoon vanilla 1/2 cup chopped pecans 2 tablespoons unsweetened cocoa powder 1/4 teaspoon baking powder 2 cups small marshmallows 1 cup semi-sweet chocolate pieces 1 cup creamy peanut butter 1 1/2 cups Rice Krispies cereal

Preheat oven to 350 degrees. Cream together butter or margarine and sugar. In a large bowl, beat together the eggs and vanilla. In a medium bowl, stir together the flour, nuts, cocoa, baking powder and 1/4 teaspoon salt. Stir this into egg mixture. Spread mixture in bottom of a greased 13X9X2 inch pan. Bake for 15 to 20 minutes or until bars are done.