Aebleskiver (Danish)

2 large egg whites 2 cups buttermilk 2 cups all-purpose flour 2 large egg yolks 4 tablespoons butter, melted 1 tablespoon white sugar 2 teaspoons baking powder ½ teaspoon baking soda ½ teaspoon salt 1 cup vegetable oil for frying Beat egg whites in a clean glass or metal bowl with an electric mixer on high speed until stiff peaks form. Set aside. Mix together buttermilk, flour, egg yolks, melted butter, sugar, baking powder, baking…