Easy & Simple Banana Muffins

1 Preheat oven to 350°F and line a standard muffin pan with paper liners or lightly grease each muffin cup.
2 In a large mixing bowl, mash the ripe bananas with a fork until mostly smooth.
3 Add the melted coconut oil, maple syrup, egg, vanilla extract, and milk to the mashed bananas and whisk until well combined.
4 Add the flour, baking powder, baking soda, salt, and cinnamon to the wet ingredients and gently mix until just combined, being careful not to overmix.
5 If using chocolate chips or chopped walnuts, gently fold them into the batter.
6 Divide the batter evenly among the prepared muffin cups, filling each approximately 3/4 full.
7 Bake at 350°F for 23–25 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
8 Allow the muffins to cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.