01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease with oil or butter.
02 - In a large bowl, mash the bananas until smooth. Whisk in eggs, honey or maple syrup, milk, vanilla extract, and melted coconut oil until fully incorporated.
03 - In a separate bowl, whisk together rolled oats, baking powder, ground cinnamon, and salt until evenly distributed.
04 - Add the dry ingredients to the wet mixture. Stir until just combined, being careful not to overmix. Gently fold in any desired optional add-ins such as nuts, chocolate chips, or berries.
05 - Divide the batter evenly among the prepared muffin cups, filling each about three-quarters full to allow for rising.
06 - Bake for 22 to 25 minutes, or until centers are set and tops are lightly golden brown. A toothpick inserted into the center should come out clean.
07 - Let the oatmeal cups cool in the pan for 5 minutes before transferring to a wire rack. Serve warm or at room temperature, topped with Greek yogurt and additional toppings if desired.