Combine the mashed banana, egg, buttermilk, and melted butter in a large mixing bowl or the bowl of a stand mixer. Use the paddle and mx until blended on medium speed about 30 seconds.
Turn mixer off.
Add the sugar, flour, baking soda and salt to the bowl. Mix by hand in a folding motion until wet and dry ingredients are incorporated.
Fold in 1/4 cup water. The batter should be thick.
Butter the griddle. Using a 1/3 cup measure, scoop out batter onto the hot griddle.
Cook for about 2-3 minutes or until bubbles form.
Turn pancake carefully, Do not pat down!
Cook for about 2 more minutes or until pancake springs back when poked quickly in the middle .
Serve immediately with fresh sliced bananas, sprinkle with cinnamon or powdered sugar.