Preheat the oven to 375°F and lightly butter an 8-, 9-, or 10-inch baking dish.
Arrange the apple slices in the dish. Sprinkle evenly with ¼ cup brown sugar and ½ teaspoon cinnamon, then toss gently to coat.
In a separate bowl, combine the flour, oats, brown sugar, cinnamon, nutmeg, and salt.
Add the melted butter and mix with a fork or your fingers until crumbly.
Sprinkle the topping evenly over the apples.
Bake for 30–32 minutes, until the apples are tender and the topping is golden brown.
Serve warm with whipped cream or vanilla ice cream.
Extra Tip
If the butter is too firm to blend easily with the dry ingredients, microwave the mixture for 10–15 seconds to soften it. Substituting oat flour for all-purpose flour will make this recipe gluten-free.
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