Source: Williams Sonoma Ingredients: 2 cups flour 1 teaspoon baking powder 1/2 teaspoon salt 1 tablespoon sugar 4 eggs, separated 2 cups milk 4 tablespoons butter, melted, plus more for cooking Fillings such as jam, peanut butter, chocolate or fruit Syrup, whipped cream or powdered sugar for serving Directions: In a bowl, whisk together the flour, baking powder, salt and sugar. In a small bowl, lightly whisk the egg yolks, then whisk in the milk and the melted butter. Whisk the yolk mixture into the flour mixture until well combined; the batter will be lumpy. In another bowl, using an electric mixer fitted with the whisk attachment, beat the egg whites on high speed until stiff but not dry peaks form, 2 to 3 minutes. Using a rubber spatula, gently stir the whites into the batter in 2 additions. Put 1/4 teaspoon butter in each well of the pan. Set over medium high heat and heat until butter begins to bubble. Pour 1 tablespoon batter into each well. Put 1 teaspoon of th...