Preheat oven to 375°. Using a melon baller or a spoon, scoop out core from each apple.
In a small bowl, combine melted butter, brown sugar, and cinnamon.
Place apples in a large baking dish and brush with butter mixture. Divide chocolate between apples and bake until chocolate is melty and apples are fork-tender, 20 minutes.
Turn oven to broil. Place a marshmallow on top of each apple and broil until toasted, about 2 minutes.
Sprinkle with crushed graham crackers before serving.
Recipe by The Best Video Recipes for All at https://recipes-for-all.com/smores-stuffed-apples/