Wash and dry the apples.
Remove stems and skewer a popsicle stick in each apple; set aside.
Line a baking sheet with wax paper and grease with cooking spray; place in fridge for 15 minutes.
Place butter in a saucepan and cook over medium-low heat until it melts.
Add marshmallows and stir until melted.
Remove apples from fridge and dip each apple into the melted marshmallows mixture and transfer to prepared baking sheet. Place in the fridge.
In the meantime, melt the chocolate chips.
Put chocolate chips in a microwave-safe bowl and add 2 tablespoons oil.
Cook for 40 seconds on full power; stir and continue to cook checking at 15-second intervals, stirring each time.
Stop heating when most of the chips are melted. There should be a few chunks left; stir until smooth.
Place the ground graham crackers in a bowl.
Remove apples from fridge and dip each apple into the melted chocolate, rotating to coat evenly.
Dip chocolate-covered apples into the ground graham crackers, and coat on all sides.
Put the apples back on the lined baking sheet.
Refrigerate for 20 to 30 minutes.