Step 1

Preheat the oven to 375 degrees Fahrenheit. Peel, core, and slice the apples to about 1/4 inch thick. Set aside.

Step 2

In a large bowl, whisk the flour, brown sugar, cinnamon, and salt until well mixed. Cut in 1 cup butter with a pastry cutter or rub between your fingers until it resembles coarse crumbs.

Step 3

Stir the oats into the topping mix, then place in the fridge until ready to use.

Step 4

Warm 2 tablespoons butter in a 10- or 12-inch cast iron skillet over medium heat. When it’s melted, add the brown sugar, cornstarch, lemon juice, cinnamon, nutmeg, and salt. Whisk until smooth, then add the apple slices and stir until well coated.

Step 5

Remove the skillet from the heat and pour the crumble topping over the top. Use a spoon or spatula to ensure it covers the apples fully.

Step 6

Bake for 30-40 minutes or until the topping is golden brown and the apples are tender. Let cool on a wire rack for at least 15 minutes before serving.

Step 7

Serve warm with vanilla ice cream or whipped cream. Enjoy!