Preheat the oven to 375°F (190°C). Grease a 2 to 2½-quart (2–2.5 L) baking dish or an 8x8-inch (20x20 cm) or 9x9-inch (23x23 cm) dish.
cooking spray
In a bowl, combine the snickerdoodle cookie mix with the butter and egg, setting aside the cinnamon sugar packet that comes with the mix. Mix until well combined and crumbly. (Ignore instructions on the bag of snickerdoodle mix when it comes to preparation.)
1 package (~ 17.9 oz / 507 g) snickerdoodle cookie mix, ½ cup (113 g) butter, 1 large egg
Spread the apple pie filling evenly in the prepared dish. Sprinkle the cinnamon, nutmeg, and salt over the apple filling and stir gently to mix.
1 can (21 oz / 595 g) apple pie filling, ½ tsp (1 g) ground cinnamon, ¼ tsp (0.5 g) ground nutmeg, ⅛ tsp (0.8 g) kosher salt
Scatter 2 to 4 tablespoons (18–36 g) of toffee bits over the filling.
2-4 tbsps (18-36 g) toffee bits
Use clean hands to sprinkle the cookie mixture evenly over the apples, covering the filling without pressing it down so the topping stays light and crumbly. You may have some cookie mixture left over.
Sprinkle half of the cinnamon sugar packet over the topping, saving the rest for serving.
Bake for 25 to 35 minutes, or until the topping is golden brown and a toothpick inserted in the crust comes out clean.
Before serving, sprinkle with more toffee bits (optional) and cinnamon sugar, then drizzle with caramel topping.
½ cup (120 g) caramel sauce