4 large Granny Smith apples, peeled, cored, and sliced into thin wedges
1/2 cup granulated sugar
1 tablespoon ground cinnamon
1/2 teaspoon ground nutmeg
1 tablespoon lemon juice
1/2 cup rolled oats (old fashioned)
1/2 cup all-purpose flour
1/2 cup brown sugar, packed
1/4 cup unsalted butter, cold and cubed
1/4 teaspoon salt
Instructions
In a large mixing bowl, combine the sliced apples, granulated sugar, cinnamon, nutmeg, and lemon juice. Toss everything together until the apples are evenly coated in the spices and sugar.
In a separate medium bowl, whisk together the rolled oats, flour, brown sugar, and salt. Add the cold, cubed butter. Use a pastry cutter or your clean fingertips to work the butter into the dry ingredients until the mixture looks like coarse crumbs with some pea-sized pieces of butter remaining.
Grease a small baking dish or an air-fryer-safe pan that fits inside your air fryer basket. Pour the seasoned apple mixture into the dish, spreading them out evenly. Sprinkle the oat crumble topping generously over the top of the apples, covering them completely.
Place the dish into the air fryer basket. Set the air fryer to 350°F (175°C) and cook for 18 to 20 minutes. Check at the 15-minute mark; if the topping is browning too quickly, you can cover it loosely with a small piece of foil. The crisp is done when the apples are fork-tender and the topping is golden brown and crunchy.
Carefully remove the dish from the air fryer using oven mitts. Let the apple crisp sit for about 5 to 10 minutes before serving. This allows the juices to thicken slightly, making for a much better eating experience.