In a medium bowl, whisk together the eggs, egg whites, milk, thyme, salt, and black pepper.
Heat the olive oil in a medium skillet over medium heat. Once the skillet is hot, add the leeks and cook until softened, about 2 minutes. Add the garlic and cook until fragrant, 30 seconds more. Add the mushrooms and cook until softened and the mushrooms release their liquid, about 8 minutes.
Pour the egg mixture over the cooked vegetables and cook until the eggs solidify, about 8 minutes.
Sprinkle the top evenly with the cheese and carefully place the skillet in the broiler until the cheese has melted and the eggs have set, about 5 minutes.
Allow the frittata to cool for 10 minutes before cutting into 4 even slices.
Nutrition Information
Serving size: 1 slice Calories: 200 Fat: 13 g Saturated fat: 3.4 g Trans fat: 0 g Carbohydrates: 8 g Sugar: 3 g Sodium: 340 mg Fiber: 1 g Protein: 14 g Cholesterol: 190 mg
Recipe by Toby Amidor Nutrition at https://tobyamidornutrition.com/recipes/mushroom-and-leek-frittata-2/