Begin by laying out your flour tortillas on a clean plate. Spread a smooth layer of Nutella over each tortilla, reaching the edges. Evenly sprinkle mini marshmallows on top.

Carefully fold each tortilla in half and spread softened butter on one side. Ensure thorough coverage for a crispy exterior.

Sprinkle brown sugar over the buttered side, followed by finely crushed graham crackers. This mix will caramelize while grilling.

Preheat your grill or skillet to medium heat. Place the quesadilla butter-side down on the grill and cook for about 2 minutes until golden brown.

Flip the quesadilla, butter the other side, and grill for another 2 minutes until golden and crispy.

Remove from heat, let cool slightly, and cut into wedges. Serve warm, possibly with a scoop of ice cream.