Preheat Oven and Prepare Muffin Tin: Preheat your oven to 350°F (175°C) and grease or line a muffin tin with paper liners.
Mix Wet Ingredients: In a large bowl, combine the mashed bananas, eggs, dark brown sugar, and vanilla extract. Stir until fully combined.
Add Almond Flour: Gradually mix in the almond flour until the batter is smooth and there are no lumps.
Fill Muffin Tin: Pour the batter evenly into the muffin tin, filling each cup about two-thirds full.
Bake the Muffins: Place the muffin tin in the preheated oven and bake for 18-22 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
Cool and Serve: Allow the muffins to cool in the tin for a few minutes before transferring them to a wire rack to cool completely. Enjoy!