In a blender, combine banana, egg, milk, butter and vanilla, blitz until smooth. Pour wet ingredients into dry, whisk until smooth.
Heat a nonstick ebelskiber pan over medium-low heat, spray with cooking oil. Place 1 tablespoon pancake batter in each cavity, followed by about ½ teaspoon Nutella in the middle of each. Top with about 1 teaspoon batter, using the spoon to carefully coat the nutella entirely.
Allow to cook for 2-3 minutes.
Using two chopsticks, carefully flip one pancake over. If it’s golden brown on the bottom, continue to flip all other pancakes over.
Continue cooking for another 2-3 minutes, or until all are golden brown on both sides.Serve hot