Easy Egg Muffins

Ingredients (8)

• 4 egg whites
• 0.25 cup grated Parmesan cheese
• 1 nonstick cooking spray
• 0.25 tsp black pepper
• 6 eggs
• 1 cup thawed and squeezed frozen chopped spinach
• 0.25 cup plain nonfat Greek yogurt
• 0.25 tsp salt