1 (6 oz.) pkg. butterscotch flavored chips
1 (6 oz.) pkg. chocolate chips
1 (14 oz.) can sweetened condensed milk
1 c. chopped nuts
2 c. miniature marshmallows

Combine both kinds of chips with milk. Stir nuts and marshmallows into chocolate mixture. Spread in buttered 9-inch square baking pan. Cover and refrigerate until firm at least 2 hours. Cut into small squares.