Mash banana very well (I like to freeze and/or microwave to “melt” the banana and avoid a lot of lump) in a shallow container. A pie tin or small casserole dish works well.
Add remaining ingredients, except for bread. Whisk well until mostly lump free and well combined.
Dip slices of bread in batter and flip to get both sides. If using a thicker or drier bread, let soak briefly.
Cook on a griddle or nonstick pan over medium heat (using a spritz of nonstick spray if necessary). Cook about 2-3 minutes per side, pressing down slightly to encourage browning. Flip and cook remaining side.
Top with favorite toppings, I recommend peanut butter, more bananas, jelly or other fruit.
Notes
Recipe can easily be doubled or tripled to coat additional bread. The nutritional information below does NOT include the bread, as calorie counts can vary significantly.