1. Step
Position oven racks in the upper and lower third of the oven. Preheat oven to 300 degrees F. Line 2 large baking sheets with parchment paper or a baking mat. Beat egg whites in a medium bowl with an electric mixer until stiff peaks form. In another medium bowl, beat egg yolks, cream cheese, salt and sugar, if using, with the electric mixer until well combined. Add half of the yolk mixture to the bowl with the egg whites and fold gently with a spatula until just combined. Repeat with the remaining yolk mixture.