Preheat your oven to 350 degrees. Prepare a mini muffin pan with cooking spray. Set aside.
Combine butter and sugar and mix until smooth in a large bowl, ideally with a handheld or stand mixer.
Add eggs, milk, vanilla and mashed bananas and stir.
Mix in flour, cinnamon, baking powder, baking soda and salt until totally incorporated.
Add your lentils, walnuts or pecans or chocolate chips and gently combine. We always use a wooden spoon or rubber spatula.
Pour batter into each muffin cup.
Bake for 13-15 minutes or until a toothpick inserted in the center comes out clean.
Leave in pan for 5 minutes before placing on a wire rack to finish cooling.
Serve and enjoy every bite!