Start by combining the flour, sugar, baking powder, and salt in a large bowl.
In another bowl, whisk the milk, eggs, sourdough starter, melted butter, and mashed banana together.
Pour the wet ingredients into the dry ingredients and whisk until smooth and fully combined.
Next, heat a non-stick skillet over medium-high heat. Coat it with cooking spray or melt a small amount of butter in the pan.
Ladle some batter into the hot skillet.
Cook for 2-4 minutes until golden, flipping when the top is bubbling. Cook the other side for another 2-4 minutes.
Once done, transfer the pancake to a plate and continue with the remaining batter.
Make sure to monitor the heat to prevent burning the outside while leaving the inside undercooked.
Suggested toppings: maple syrup, berries, melted chocolate, Nutella, caramelized bananas, nut butter, honey.