Melt marshmallows and 4 Tbsp. butter. Add Rice Krispies and press into 9 x ... on base. Melt chocolate chips and 2 Tbsp. butter. ... on top of squares.
Boil sugar and syrup until ... then mix in Rice Krispies. Put on cookie sheet or jelly roll pan. Melt chocolate and butterscotch chips and spread over other mixture.