Before You Begin:
Preheat and prepare your cookware as needed. Cooking times and results may vary depending on your equipment and ingredients.
Make Brown Butter
Melt the butter in a pan over medium heat. Cook until it foams and turns light brown, then remove from heat and cool slightly.
Prepare the Apple Filling
In a large bowl, combine sliced apples, granulated sugar, brown sugar, flour, cinnamon, nutmeg, lemon juice, and salt.
Pour in the brown butter and caramel sauce. Toss gently to coat.
Make the Crumble Topping
In another bowl, mix flour, oats, brown sugar, cinnamon, and salt.
Cut in cold butter until the mixture is crumbly and sandy.
Assemble the Pie
Press the pie crust into a 9-inch dish.
Spoon the apple filling inside.
Sprinkle the crumble topping evenly over the apples.
Bake
Bake at 375°F (190°C) for about 50–55 minutes, covering the crust edges with foil after about 25 minutes if they brown too quickly. The filling should be visibly bubbling and the crumble topping golden brown.
Cool & Serve
Cool for at least 2 hours before slicing. Cooling time may vary based on filling temperature.
Drizzle extra caramel sauce before serving if desired.