Preheat the oven to 350°F and lightly grease an 8x8 baking dish.
Place the sliced apples in a large bowl and toss with the pumpkin pie spice and 1/4 cup of the caramel sauce until evenly coated.
Spread the apple mixture into the prepared baking dish.
In a separate bowl, stir together the rolled oats, flour, brown sugar, melted butter, and salt until the mixture forms clumps.
Sprinkle the oat topping evenly over the apples.
Bake for 35 to 40 minutes until the topping is golden and the apples are soft when pierced with a fork.
Remove from the oven and drizzle the remaining 1/4 cup caramel sauce over the top before serving.