Set ricotta in a fine mesh strainer about 30 minutes before you start cooking, to drain off excess liquid. We used fresh ricotta from Whole Foods that was pretty dry. If you are using a commercial brand that’s runny, you may want to drain it longer (or make your own).
Whisk together flour, baking powder, sugar, and salt in a bowl.
Combine ricotta, milk, egg yolks, and vanilla in a separate bowl.
Beat the egg whites in an electric mixer until stiff.
Add the dry ingredients to the ricotta and milk mixture, stirring gently until just combined.
Whisk in a small amount of the egg whites to lighten the batter, then fold in the remaining whites.
Heat a griddle over medium-high heat, and brush the surface with butter. Use a ladle or measuring scoop (we used a 1/3 cup measure) to pour batter onto the griddle.
Cook pancakes for about 3 or 4 minutes, then flip, cooking until both sides are golden brown.
Spread lemon curd between pancakes and dust with powdered sugar. Or serve with syrup or fruit.