Preheat the oven to 350 degrees F. Line or grease a muffin tray. Alternatively, use a silicone muffin tray without liners (my preferred method).
In large bowl, mash the cooked lentils if they are not already well-mashed after cooking. Add the mashed banana, applesauce, olive oil, egg, and vanilla extract. Whisk until combined.
In a separate bowl, combine the flour, baking soda, baking powder, and ground cinnamon. Add the dry ingredients to the bowl with the wet ones. Mix with a rubber spatula until combined.
Spoon the batter into the muffin tray, filling up each cavity about ¾ of the way.
Bake for 20 to 25 minutes or until a toothpick inserted in the center of a muffin comes out clean. Let the muffins cool completely before serving.
Leave a rating or review by tapping the stars on this recipe card (above) or in the comments section (at the end of the post)!