Start by melting butter in the microwave. Once melted, set aside to cool to room temperature. Use a fork to mash a very ripe banana, then measure to get exactly 1/3 cup.
Pour 1 tablespoon white vinegar into a liquid measuring cup. Pour milk on top of the vinegar up to the 1-1/4 cup line. Stir and set aside for 5 minutes to slightly curdle and make buttermilk.
Whisk together dry ingredients.
In a large bowl, add the mashed banana, milk mixture, egg, and vanilla, whisking briskly until smooth. Gradually pour in the butter while continuing to whisk until fully combined. Add the dry ingredients on top, then whisk just until no dry streaks remain, about 30 seconds, a few lumps are fine. Let the batter sit for about 10 minutes for better texture.
Heat a nonstick pan over medium heat. Or heat an electric griddle to 300°F. Once hot, grab stick of butter with tongs and it rub across the pan or griddle.
Use a 1/4 cup measuring cup to scoop batter and pour onto pan or griddle. It should spread to a 4-inch circle. If the batter doesn’t spread that far, you can coax it with a spoon. Cook until you see bubbles spread across the pancake. Then use a thin metal turner to flip and cook the other side. Pancakes should be nicely golden brown on each side. If pancakes or butter are burning, lower heat.
Wipe down the pan or griddle with a paper towel. Rub the butter across the skillet again and repeat until the batter is all used up. To keep pancakes warm while cooking, see note 4.
Serve pancakes as soon as possible with your toppings of choice! The vanilla sauce in note 2 is my absolute favorite!
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Notes
Note 1: Only add sugar if you aren't planning to add a very sweet topping to the pancakes. If I make the vanilla sauce, it doesn't really need the extra sugar.Note 2: To make the Vanilla Sauce, combine 1/2 cup unsalted butter, 1 cup light brown sugar, 1/2 cup heavy cream, and a pinch of salt in a medium pot. Cook over medium heat, stirring occasionally, until butter melts and syrup slightly thickens, about 5–8 mins. Remove from heat, stir in 1 tablespoon vanilla extract.Note 3: You can top these pancakes with anything you like, I love to use vanilla sauce, thinly sliced bananas, and sprinkle of cinnamon.Note 4: To keep pancakes warm while cooking, place a cooling rack on a large pan. Place the completed pancakes in a single layer on the cooling rack. Put the pan in a 200°F oven as you continue to cook more pancakes.Storage: Let pancakes cool to room temperature, then store in a resealable plastic bag in the fridge for up to 5 days. To freeze, layer pancakes between sheets of parchment paper in a freezer-safe bag and freeze for up to 2 months. Reheat leftover pancakes in the toaster.