Whisk all dry ingredients together in a medium-size bowl.
Place the egg in a large bowl and whisk the egg until lightly beaten. Add the milk and mashed bananas; mix with a large spoon until thoroughly combined. Gradually add the dry ingredients to the milk mixture, and mix until moistened. The batter will be kind of lumpy.
Lightly oil a skillet or griddle over medium-high heat, pour the pancakes to the desired size, cook until bubbles form on the top and the pancake is golden brown on the downside. Flip and continue cooking until done. (I used an electric griddle. 300F. seemed to be about right. Adjust the heat if need so the pancakes don’t brown too quickly.)