For 4 servings
Mash bananas in a large bowl until smooth.
Whisk in milk, egg, melted butter, and vanilla.
Add flour, baking powder, sugar, and salt. Stir until just combined — lumps are fine.
Heat a non-stick skillet or griddle over medium heat. Brush with butter.
Pour 1/4 cup batter per pancake. Cook until bubbles form on surface and edges look set, about 2–3 minutes.
Flip and cook another 1–2 minutes. Serve with maple syrup and extra banana slices.