An easy breakfast or brunch dish that the whole family will love.
Preheat oven to 350 degrees F (175 degrees C). Grease a 9x9-inch baking dish.
Heat butter in a skillet over medium heat; cook and stir leeks and potato in the melted butter until softened, 8 to 10 minutes. Spoon leek mixture into the prepared baking dish.
Beat eggs, mozzarella cheese, Parmesan-Reggiano cheese, salt, and pepper together in a bowl. Pour egg mixture over leek mixture.
Bake in the preheated oven until eggs are set, 20 to 25 minutes.
Per Serving: 223 calories; protein 14.7g; carbohydrates 14.3g; fat 12.1g; cholesterol 265mg; sodium 276.2mg.