Nutella-Stuffed Mini Pancakes

Recipe with video instructions: These mini pancakes are called ebelskivers and originate in Denmark! Stuff them with whatever you like and serve these bite-sized nibbles at your next brunch! Ingredients: 1 cup all-purpose flour, 1 ½ tsp sugar, ½ tsp baking powder, ¼ tsp salt, 2 eggs, yolks and whites separated, 1 cup milk, 2 tbsp unsalted butter, melted and room temperature, cooking spray, nutella