Pre-heat the oven to 350 degrees and grease a 9x13 baking dish with butter or coconut oil.
Put the pecans and pumpkin seeds into your food processor or blender and blend/pulse until the pieces are very small like a meal.
Whisk the blended pecans/pumpkin seeds, oats, collagen, coconut sugar, chia seeds, baking powder, cinnamon, pumpkin pie spice, and salt in a large mixing bowl.
Add the coconut milk, pumpkin puree, chopped apples, vanilla, and eggs, mix until combined, and pour the baked oatmeal mixture into your baking dish.
To make the topping, put the pecans into your food processor and blend until the pecans are the size of peas. Add the rest of the topping ingredients and blend/pulse until the butter is distributed and about the size of peas – it is ok if there are a few larger or smaller chunks of butter.
Sprinkle the topping over the baked oatmeal mixture.
Bake the pumpkin apple baked oatmeal at 350 degrees for 50 minutes, or until a toothpick comes out clean and the top is golden. Let the baked oatmeal cool a good 10 minutes before slicing.