In a medium bowl, whisk together the flour, sugar, baking powder and salt. Add the egg, vanilla extract and buttermilk and whisk until fully combined.
Place a little vegetable oil or butter into a medium frying pan and place over a medium heat. Add about 1/4 cup of pancake batter, place a Nutella ball on top and cover with 1/4 cup pancake batter. Cook for 2 minutes then flip and cook for another 2 minutes.
Remove from the pan and keep warm in a low oven while you cook the other pancakes.