Line 9x9 pan with parchment
Pre-heat oven to 350 degrees F
APPLE FILLING:
Add apples, brown sugar, butter and spices into a large sautee pan.
Cook on low-medium heat, stirring often, until apples have softened, about 10 minutes.
Set aside.
COOKIE BASE:
In bowl of mixer on low speed mix flour, oats, brown sugar, baking soda, salt until combined.
Slowly add in the butter in chunks with mixer on low.
Add in egg, mix on medium/low speed until you have a unified crumbly mixture.
Pour half of the mixture into prepared pan and press into place evenly with back of measuring cup.
Bake 15 minutes.
FILLING:
Evenly spread caramel sauce over cookie.
Evenly sprinkle on the walnuts.
Pour on the apple filling you made and gently spread evenly with spatula.
TOPPING:
Take the second half of the cookie mixture and evenly distribute over entire top.
Bake 30 minutes.
Remove from oven and let cool completely before cutting.
GARNISH (optional):
Drizzle with caramel sauce and sprinkle with additional walnuts.