Preheat the broiler on your oven.

Spread approximately 1 tsp of Nutella on each of the graham cracker squares.

Place onto a baking sheet lined with parchment or foil.

Add one regular marshmallow or 6-8 mini-marshmallows per square.

Place the cookie sheet in the oven, under the broiler, with the door open so you can carefully watch them brown.

Remove from the oven as they begin to brown. Place any that haven't browned fully back in for a few more seconds, watching carefully, and removing as soon as they are ready.

Cool slightly and enjoy!

These can also be saved for a later time by placing in an air tight container after they've cooled. They are still gooey and delicious, even once cooled.