Instructions

  1. Preheat broiler.
  2. Heat olive oil in 10-inch-diameter nonstick skillet over medium-high heat. Add onion and bell pepper; sauté until golden, about 8 minutes.
  3. Add zucchini; sauté until tender, about 5 minutes. Add spinach; stir until wilted, about 1 minute.
  4. Season with salt and pepper.
  5. Whisk eggs, egg whites, salt and pepper in medium bowl to blend.
  6. Pour egg mixture over hot vegetables in skillet; stir gently to combine, reduce heat to medium-low.
  7. Cook without stirring until eggs are set on bottom, about 5 minutes.
  8. Sprinkle cheese over frittata. Broil until cheese melts, about 2 minutes.
  9. Sprinkle with tomatoes and basil.