Preheat oven to 325 degrees.
Spray bundt pan with baking spray. Set aside.
In a large mixing bowl, whisk together flour, brown sugar, baking powder, baking soda, salt, and apple pie spice. Set aside.
In a medium bowl, combine eggs, vegetable oil, sour cream, and vanilla.
Mix well.
Add to dry ingredients.
Stir together until combined.
Fold in apples.
Pour batter into prepared pan and bake for 45 minutes, or until cake tests done.
Let cake cool in pan for 15-20 minutes. Turn out and cool.
Drizzle with caramel sauce.