Preheat the oven to 350°F. Generously spray a 9x13-inch baking dish with Baker’s Joy or a generic version. Set it aside.
Add the flour, apple pie spice, baking soda, and salt to a medium-sized bowl. Whisk to combine.
Add the vegetable oil and sugars to a large mixing bowl. Whisk to completely incorporate.
Whisk in the eggs and vanilla until well combined.
Stir in the dry ingredients until just combined. Do not over-stir, but be sure no streaks of flour are visible.
Stir in the diced apples and 1 cup of chopped pecans.
Evenly spread the cake batter into the prepared baking dish. Bake for 45 minutes, or until a toothpick inserted comes out clean (a few crumbs may cling to the toothpick).
Add the dulce de leche to a small heat-safe bowl. Heat in the microwave for 45 seconds, just to loosen the caramel.
Whisk in the heavy cream until smooth. Evenly spread over the cake.
Sprinkle the reserved ½ cup of chopped pecans around the edge of the cake. Slice into twelve 2-inch x 3-inch slices.