Vegetable Frittata Muffins

Eggs pack in the protein as heart-healthy mushrooms and red bell pepper slices add vitamin C to these miniature frittata muffins.

Ingredients:

• nonstick cooking spray, for preparing the muffin cups
• 1 tablespoon canola oil
• 1/2 yellow onion, diced
• 1 red bell pepper, diced
• 8 ounces button mushrooms, trimmed and sliced
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper
• 4 eggs
• 4 egg whites
• 1/2 cup skim milk
• 3/4 cup shredded, reduced-fat cheddar cheese
• 1/2 zucchini, diced