Prepare your heat source to create medium low heat. If using a campfire or grill, indirect heat is best. If using a stovetop, set heat to medium low. If using an oven, preheat to 300 degrees.
Spray a small cast iron skillet generously with non-stick cooking spray
Add the chocolate and peanut butter cups into the skillet and place over your medium low heat source
As soon as the chocolate begins to melt, spread the marshmallows over the entire skillet
As soon as the marshmallows begin to soften, transfer the skillet off of the heat
Optional: brûlée the marshmallows to slightly char, if desired
Dip graham crackers, pretzels, cookie or fresh fruit into the melted chocolate and marshmallows