Crustless Caramelized Onion Tomato and Cheese Tart

Ingredients

• 1 1/2 tablespoons olive oil
• 1 tablespoon butter
• 4 medium red onions, thinly sliced
• teaspoon salt
• 1 teaspoon balsamic vinegar
• 1 cup reduced-fat jarlsberg or gruyere cheese, shredded
• 1 cup part-skim mozzarella cheese, shredded
• 3 eggs
• 4 egg whites
• 2 plum tomatoes or 1 beefsteak tomato, sliced
• 1 tablespoon grated Parmesan cheese

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