Cheesy Egg White Frittata with Vegetables and Bacon

Ingredients

• 8 slices turkey bacon
• 1 tablespoon unsalted butter
• 1 cup frozen cauliflower
• 1 medium red bell pepper, chopped
• 2 green onions, finely chopped
• 1 cup liquid egg whites
• ¼ cup water
• ½ teaspoon dried oregano
• ¼ teaspoon ground black pepper
• ¼ teaspoon garlic powder
• 8 ounces shredded mozzarella cheese
• 1 (6 ounce) can mushroom stems and pieces
• ½ cup grated Parmesan cheese
• 1 medium tomato, chopped