In a large bowl, whisk together flour, baking powder, baking soda, salt, and cinnamon.

In another bowl, place peeled bananas and mash with a fork until pulpy and syrupy. Stir in buttermilk until combined. Add oil, honey, and egg, and mix with a fork until fully combined.

Using a mixing spoon, stir the wet ingredients into the dry ingredients until no dry pockets of flour remain.

Heat a large nonstick skillet over medium high. Lightly grease pan before pouring 1/4 cup scoops of batter in 3 places on the surface, being careful not to allow any of the mounds to touch. Use the back of the measuring cup to spread the batter until it is about 1/2 inch thick. When bubbles appear on the surface of the batter, gently flip each pancake with a spatula. Cook until edges are crisp and dry and the center is no longer liquid.

Top warm pancakes with banana slices and maple syrup. Serve immediately.