Preheat the oven to 350F, and spray a regular 12 hole muffin tin with some nonstick cooking spray.
In a bowl, whisk together the egg, egg whites, and 3 tablespoons of brown sugar (leave 1 tablespoon aside).
Stir in the mashed bananas, milk, and vanilla extract.
Mix in the oats, cinnamon, baking powder, and 3 tablespoons of chopped walnuts (leave 1 tablespoon aside).
Divide the batter into the 12 muffin cups. In a small bowl, mix together the remaining tablespoon of brown sugar and chopped walnuts. Sprinkle the sugared nuts on top of the muffins before baking.
Place the honey in a small ziplock bag, and cut a tiny hole in the corner. Drizzle the honey over the 12 muffins.
Bake them in the oven for approx 22 minutes.
Let them cool slightly before removing them from the pan. Enjoy!