In a bowl, beat the eggs with freshly grated cheese. Season with salt.
Heat the olive oil in a nonstick frying pan. Add the potatoes, red peppers, and onions, and cook for 5 minutes, or until the vegetables are soft.
Pour the egg mixture into the pan. With a fork, evenly distribute egg mixture to the edges of the pan.
Cook for approximately 3 to 4 minutes with a lid on. Carefully flip the frittata over and cook for another 2 minutes. Serve hot or cold.
Per serving: Calories 382; Total Fat 27 grams; Saturated Fat 8 grams; Protein 19 grams; Total Carbohydrate 15 grams; Sugar: 3 grams; Fiber 2 grams; Cholesterol 297 milligrams; Sodium 563 milligrams