5 tablespoons unsalted butter, plus more for coating the frying pan and serving
1 cup whole milk
1 1/4 cups all-purpose flour
1 1/2 teaspoons baking powder
1 teaspoon fine salt
3 large eggs, yolks and whites separated
2 tablespoons granulated sugar
1 tablespoon packed finely grated lemon zest (from about 2 to 3 medium lemons)
1/2 teaspoon vanilla extract
3/4 cup whole-milk "ricotta cheese":/recipes/28983
Powdered sugar, fruit, or maple syrup, for serving (optional