Preheat oven to 350°F. Grease a muffin tin, line with foil liners, or use silicon liners.
Whisk together almond flour, flax or chia, baking soda, baking powder, salt, cinnamon, and nutmeg. Set aside.
Stir together mashed bananas and oil or butter until well combined. Stir in eggs, vanilla extract, and almond extract.
Stir banana mixture into dry ingredients. Mix until well combined.
Transfer batter to prepared muffin tin or to silicon liners. Bake in preheated oven for 20-22 minutes until a toothpick inserted in the center comes out clean. Let cool. Keep covered for up to 4 days.