Place the tortilla onto a cutting board or other surface and spread the butter in a thin, even layer on top of it.
1 large flour tortilla, 1 tbsp butter
Mix together cinnamon and sugar in a small bowl, then sprinkle it evenly over the butter. Pat it lightly into the butter so that it sticks.
1 tbsp granulated sugar, 1/2 tsp cinnamon
Flip the tortilla over so that the cinnamon sugar side is facing down. Spread chocolate hazelnut spread all over the exposed side of the tortilla.
2 tbsp chocolate hazelnut spread
On one half of the tortilla covered in chocolate hazelnut spread, sprinkle the diced strawberries, then the marshmallows. Fold the half of the tortilla not covered in strawberries and marshmallows over the strawberry marshmallow half, creating a half moon shape.
1/4 diced strawberries (about 2-3 strawberries), ¼ cup mini marshmallows
Heat a non-stick pan over medium-low heat. Place the quesadilla into the pan and cook for about 3 to 4 minutes, then carefully flip the tortilla over using a long spatula. Cook it for another 3 minutes on the second side, or until the chocolate spread and marshmallows are slightly warmed through and the cinnamon sugar is lightly caramelized on the outside.
Slice the quesadilla into 4 pieces and dust with powdered sugar. Serve immediately.
Powdered sugar