Preheat the oven to 450℉/230℃.
Prepare any sides you might want with the dip like cookies/graham crackers. This all comes together really quickly.
In a 9" skillet or cake pan, add the chocolate chips and peanut butter cups. Scatter over the marshmallows.
Place in the oven for 5 minutes, until golden on top. Leave a little longer (up to 3 minutes) if you prefer more toasted marshmallows!
Remove and serve immediately!