These mini pancakes called 'ebelskivers' originate in Denmark and can be stuffed with whatever you like.
1 cup all-purpose flour
1 1/2 teaspoons sugar
1/2 teaspoon baking powder
1/4 teaspoon salt
2 eggs, yolks and whites separated
1 cup milk
2 tablespoons unsalted butter, melted and room temperature
Combine the flour, sugar, baking powder and salt in a bowl. In a separate bowl, whisk the egg yolks, then add the milk and butter. Add the flour mixture and whisk until well combined, but still lumpy.
In a separate bowl, beat the egg whites with an electric mixer until stiff peaks form. Add 1/3 of the egg whites to the batter and gently fold to combine. Add the remaining egg whites and gently fold until just combined.
Spray an ebelskiver pan with cooking spray and place on a stove set to medium heat. Once the pan is warm, spoon about 2 tablespoons of batter into each well. Dollop about 1 teaspoon of Nutella into the center of each well - placing the Nutella in a piping bag makes this MUCH easier! Spoon enough batter on top to seal the pancakes closed.
Once the surface begins to bubble, flip over the pancakes using two skewers, so that the cooked side is facing up. Cook until the bottom turns golden brown.
Transfer the pancakes to a plate and enjoy!