Potato Pea and Onion Frittata

Ingredients

• 2 tablespoons (1 oz or 30 g) butter
• 2 (7 oz or 200 g) potatoes, thinly sliced
• 1/2 cup (75 g) frozen green peas, thawed
• 2 (1.7 oz or 40 g) shallots, thinly sliced
• 2 (3 g) cloves garlic, minced
• 4 (2 oz or 60 g) whole eggs
• 4 (1.7 oz or 40 g) egg whites
• 1/3 cup (3 oz or 85 ml) milk
• 2 tablespoons (7 g) fresh parsley, chopped
• 2 tablespoons (7 g) sliced green onions
• salt and freshly ground black pepper to taste