Spinach Feta Frittata

Ingredients (9)

• 2 whole eggs
• 8 large egg whites
• 1 tsp olive oil
• 1/2 red onion
• 3 scallions
• 10 oz frozen chopped spinach
• 2 oz crumbled feta
• 2 tbsp Parmigiano-Reggiano
• salt and freshly ground pepper