Preheat your oven to 350°F and grease a standard 12-cup muffin tin or line with silicone liners.
In a large mixing bowl, mash the half banana until it reaches a smooth, creamy consistency.
Whisk the liquid egg whites, pumpkin puree, maple syrup, and vanilla extract into the mashed banana until well combined.
Add the whole rolled oats, baking powder, cinnamon, ginger, nutmeg, cloves, and sea salt to the wet mixture.
Stir the batter thoroughly and let it sit for 5 to 10 minutes to allow the oats to absorb some of the liquid.
Distribute the batter evenly among the muffin cups, filling each nearly to the top.
Bake for 22-25 minutes or until the tops are firm and a toothpick inserted into the center comes out clean.
Remove from the oven and let the muffins cool in the pan for 10 minutes before transferring to a wire rack to cool completely.