01 -
Combine flour, salt, baking powder, and baking soda in a small bowl with a whisk. Reserve until needed.
02 -
Place banana in a mixing bowl and mash into a smooth paste with a potato masher. Add egg and sugar and whisk thoroughly until sugar is dissolved and mixture is smooth and creamy, about 2 minutes.
03 -
Add milk, vanilla extract, 1/4 cup melted butter, walnuts, and flour mixture to the banana mixture. Whisk until just combined.
04 -
Let batter rest for 10 minutes.
05 -
Melt 1 tablespoon butter in a large, nonstick pan or skillet over medium-high heat. Once the pan is hot, transfer in about 1/3 cup of the batter per pancake. Reduce heat to medium and cook until edges start to look dry and small air bubbles pop up through the surface, about 3 minutes.
06 -
Flip pancakes and cook until golden brown, about 3 minutes more. Serve immediately with butter, banana slices, and warm maple syrup if desired.