01 -
Line a 9x13-inch baking dish with non-stick foil and set aside.
02 -
Combine chocolate chips, butterscotch chips, and peanut butter in a large microwave-safe bowl. Microwave on high in 30-second intervals, stirring between each, until fully melted and smooth.
03 -
Gently fold mini marshmallows into the warm melted mixture until evenly coated.
04 -
Spread the marshmallow mixture evenly into the prepared baking dish.
05 -
Distribute M&M's over the surface and press down lightly to adhere.
06 -
Refrigerate uncovered for approximately 2 hours, or until thoroughly set.
07 -
Cut into bars and store leftovers in an airtight container.