Preheat oven to 350 degrees F. Line muffin tin with muffin liners and spray the inside of the liners with nonstick cooking spray.
In large bowl, whisk together almond flour, oat flour, baking soda, sea salt and cinnamon
In a separate bowl, mix together mashed bananas, eggs, ACV, vanilla extract, almond butter, almond milk.
Add dry ingredients to wet ingredients and stir until combined. Fold in blueberries.
To make crumble, Combine oat flour, oats, brown sugar, coconut oil and cinnamon in a medium bowl. Mix with a fork until coarsely crumbled.
Pour batter into muffin pan, carefully topping with crumble topping.
Bake for 20-23 minutes or until toothpick comes out clean.
Remove muffins and let them cool. They will harden slightly but they will still have a chewy soft texture, due to the almond meal/flour.