Mash the ripe bananas in a large mixing bowl until mostly smooth.
Add the egg, milk, melted butter, and vanilla extract. Whisk until the mixture is well combined.
In a separate bowl, whisk together the flour, baking powder, cinnamon, and salt. Add the sugar if using.
Gradually add the dry ingredients to the banana mixture. Stir gently until just combined. Do not overmix; a few small lumps are fine.
Heat a lightly greased skillet or griddle over medium heat.
Pour about ¼ cup of batter onto the skillet for each pancake.
Cook for about 2–3 minutes, or until bubbles form on the surface and the edges begin to look set.
Carefully flip the pancakes and cook for another 1–2 minutes, until golden and cooked through.
Continue with the remaining batter, lightly greasing the skillet as needed.
Serve the pancakes warm with maple syrup, banana slices, berries, nuts, or powdered sugar.