Preheat oven to 350°F (175°C) and line a cupcake pan with paper liners.
In a large bowl, whisk together flour, cinnamon, sugar, baking powder, and salt.
In another bowl, mix melted butter, eggs, and milk until combined. Fold this mixture into the dry ingredients until just blended.
Stir in graham cracker crumbs, mini marshmallows, and chocolate chips.
Spoon batter into prepared liners, filling them two-thirds full.
Bake for 18–20 minutes or until golden brown and a toothpick comes out clean. Let cool before serving.
