- cooking spray
- 3/4 cup butter, melted
- 2 individual packages graham crackers, crushed
- 1/2 (12 ounce) bag chocolate chips, or more to taste
- 1/2 (12 ounce) package butterscotch chips
- 1/2 (10.5 ounce) package miniature marshmallows
- 1/2 (14 ounce) can sweetened condensed milk, or more to taste
- Preheat oven to 350 degrees F (175 degrees C). Grease an 8×8-inch square pan with cooking spray.
- Mix melted butter and graham cracker crumbs together; press into an even layer at the bottom of the pan. Top with chocolate chips, butterscotch chips, and marshmallows. Drizzle sweetened condensed milk on top.
- Bake in the preheated oven until bubbly, 17 to 20 minutes.
- Let cool, about 30 minutes. To make it easier to cut into bars, cover with plastic wrap and chill, about 30 minutes.