Preheat Oven: Preheat your oven to 350°F (175°C) and lightly grease a pizza pan with butter or nonstick spray.
Prepare the Crust: Roll the pie crust into a circle large enough to fit a pizza pan (about 14 inches in diameter). Fold the edges back slightly to form a crust.
Make the Apple Topping: In a mixing bowl, toss the sliced apples with brown sugar, flour, and cinnamon. Spread evenly over the pie crust.
Prepare the Crisp Topping: Combine flour, brown sugar, oats, and cinnamon in a bowl. Add butter and caramel sauce. Use a fork or pastry blender to mix until crumbly.
Assemble the Pizza: Sprinkle the crisp topping evenly over the apples. Drizzle ¼–½ cup of caramel sauce over the top.
Bake: Bake in the preheated oven for 35–40 minutes, until the crust is golden brown and the apples are tender.
Cool and Serve: Let the pizza cool for 10 minutes before slicing. Serve warm or at room temperature, optionally with vanilla ice cream or additional caramel sauce.