- 8 large Granny Smith apples, cored and sliced
- 1/2 cup white sugar
- 2 1/2 tablespoons all-purpose flour
- 1 teaspoon ground cinnamon
- 1 cup butter, melted
- 1 1/2 teaspoons ground nutmeg
- 2 teaspoons ground cinnamon
- 1 cup firmly packed brown sugar
- 1 cup quick cooking oats
- 1 cup all-purpose flour
- 2 cups miniature marshmallows
- Preheat oven to 375 degrees F (190 degrees C).
- In a bowl, mix the apple slices, white sugar, 2 1/2 tablespoons of flour, and 1 teaspoon of cinnamon together until thoroughly combined; spread out into a 9×13-inch baking dish. In a separate large bowl, mix the melted butter with nutmeg and 2 teaspoons of cinnamon; stir in the brown sugar, oats, 1 cup of flour, and mini marshmallows until thoroughly combined. Spread the marshmallow topping evenly over the apples, and gently flatten the topping to a smooth layer.
- Bake in the preheated oven until the apples are tender and the topping is golden brown, 30 to 35 minutes.