Pre-heat oven to 350 and grease a loaf pan with coconut oil spray (or any spray/butter/oil).
In a large bowl, mix eggs, applesauce, maple syrup, coconut sugar, milk, and vanilla. Mix well. Pour in oats, all flours, baking powder, cinnamon, all spice + salt. Stir well to combine. Fold in 3/4 of the chopped apple mixture. Set aside.
Make the crumble by chopping pecans + walnuts into small pieces and adding to a small bowl with rest of ingredients. Stir to mix.
Add half of the bread batter to the greased loaf pan and spread evenly. Drizzle half of the crumble mixture on top and roughly spread around. Add the rest of the batter on top and finish with the remainder of the crumble mix, spreading evenly on the top later. Sprinkle the rest of chopped apples on top.
Bake for 40-50 minutes. I used a glass loaf pan so it took a little longer, about 45 minutes. I suggest checking it after 40 min. Look for a toothpick to come out mostly clean, browning on the edges + slightly cracking on top.
Let rest for at least 10 minutes before slicing. Will keep on counter covered for 2 days, and then in the fridge for a few more.