In a large bowl, blend together cinnamon, nutmeg, sugar, and vanilla. Toss this mix with the chopped apples until they’re evenly coated, then spread them into a greased 9x13 baking dish.

In the same bowl, combine flour, sugar, baking powder, and salt. Stir together and then sprinkle this dry mixture evenly over the apple layer you just prepared.

Pour the melted butter over the entire topping, ensuring the mixture is well-coated. Tilt the pan if necessary to cover any dry spots.

Preheat your oven to 350°F. Place the dish in the oven and bake for 45 to 50 minutes, watching for the topping to turn golden brown and the apple mixture to become bubbly.

Once baked, let it cool slightly. Serve warm, either on its own or with a scoop of vanilla ice cream or a dollop of whipped cream.