01 - In a large mixing bowl, whisk together the all-purpose flour, baking powder, and salt until well blended.
02 - In a separate medium mixing bowl, whisk together the mashed banana, melted unsalted butter, large egg, buttermilk, brown sugar, and pure vanilla extract until completely smooth and homogeneous.
03 - Pour the wet mixture into the flour mixture. Using a rubber spatula, gently fold together until just combined, maintaining a few lumps for maximum tenderness. Avoid overmixing.
04 - Place a griddle or large nonstick skillet over medium-low heat. Lightly grease with additional butter to prevent sticking.
05 - Pour approximately 1/3 cup of batter per pancake onto the heated surface, gently spreading into a circle. Cook for 2 to 3 minutes, until bubbles form on the top and the edges appear set.
06 - Flip each pancake with a spatula and continue to cook for another 2 to 3 minutes, or until golden brown and cooked through. Adjust heat as needed to avoid overbrowning.
07 - Transfer pancakes to serving plates and serve warm, accompanied by butter, maple syrup, sliced banana, chopped walnuts, or chocolate chips as desired.