Preheat oven to 350 degrees F, and grease a muffin tin with coconut oil or line with muffin liners.
In a skillet over medium heat, cook the bacon slices. Crumble the bacon and set aside the fat.
In large mixing bowl, combine almond flour, coconut flour, cinnamon, baking soda, and sea salt.
In a separate bowl, mix together coconut oil, bacon fat, eggs, and maple syrup.
Pour wet ingredients into the dry ingredients, and stir together.
Fold in half of the bacon bits and shredded apple into the mix.
Pour the batter evenly into the muffin tins to make 6 muffins.
Top the muffins with the remaining bacon bits evenly.
Bake for 18-20 minutes until a toothpick comes out clean when you insert it into a muffin.
Cool for at least 15 minutes before removing from muffin tin.