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 thoroughly. Whisk in eggs, honey or maple syrup, milk, vanilla, and melted coconut oil until the mixture is smooth and well combined.
03 - In a separate bowl, mix together the oats, baking powder, ground cinnamon, and salt until evenly distributed.
04 - Add the dry ingredients to the wet mixture and stir until just combined. Gently fold in any optional add-ins if desired, being careful not to overmix.
05 - Divide the batter evenly among the prepared muffin cups, filling each about 3/4 full to allow for rising during baking.
06 - Bake for 22-25 minutes, or until the centers are set and a toothpick inserted comes out clean. The tops should be lightly golden brown.
07 - Allow the oatmeal cups to cool in the pan for 5 minutes, then carefully transfer them to a wire rack to cool completely.
08 - Serve warm or at room temperature with a dollop of Greek yogurt on top. Add optional toppings such as sliced banana, drizzled honey, or nuts as desired.