In a large mixing bowl, whisk together the flour, sugar, baking powder, baking soda, and salt. Add the buttermilk, melted butter, egg yolks, and mashed banana to the dry ingredients. Mix just until combined. Don’t overmix, or your pancakes can turn dense.
1 cup All-purpose flour, 1 tbsp Granulated sugar, 1 1/2 tsp Baking powder, 1/4 tsp Baking soda, 1/4 tsp Kosher salt, 1/4 cup Unsalted butter, 1/2 cup Buttermilk, 2 large Eggs