Frittata is one of Italy's most beloved home-cooked dishes. Similar to an omelet but cooked more slowly, a frittata is thicker, fluffier, and filled with vegetables, cheeses, herbs, or meats. This zucchini version is light, fresh, and perfect for breakfast, brunch, lunch, or even a light dinner. It can be served warm, at room temperature, or chilled, making it ideal for picnics and meal prep.

   The butter must be taken out of the refrigerator in advance because for this recipe it must be soft.