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 extract, and melted coconut oil until smooth and well blended.
03 - In a separate bowl, combine old-fashioned rolled oats, baking powder, ground cinnamon, and salt. Stir to distribute evenly.
04 - Add dry ingredients to the wet mixture and stir until just combined. Gently fold in any optional add-ins such as chopped nuts, chocolate chips, or berries if desired.
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 the tops are lightly golden brown. A toothpick inserted into the center should come out clean.
07 - Allow oatmeal cups to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely. Serve warm or at room temperature with a dollop of Greek yogurt and optional toppings.