Preheat the oven to 450°F.
Arrange the Reese's Peanut Butter Cups in a single layer in a 9-inch cake pan. Top the Reese's with the marshmallows.
Bake the dip for 8 to 10 minutes until the marshmallows are golden and toasted.
Remove the dip from the oven and serve immediately with graham crackers for dipping.
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