Eggplant Napoleon

Ingredients

• 2 teaspoons olive oil
• 1 large onion, chopped
• 8 ounces mushrooms, sliced
• 3 small zucchini, chopped
• 1 14.5-ounce can no salt added petite diced tomatoes
• 1 14.5-ounce can no salt added crushed tomatoes
• 1 teaspoon dried oregano
• 1/2 teaspoon dried thyme
• 1/2 teaspoon black pepper
• 1/4 teaspoon red pepper flakes
• 2 large eggplants, sliced 3/4"" thick
• 2 egg whites, beaten
• 1/2 cup bread crumbs (preferably whole-wheat or panko)
• 1/4 cup Parmesan cheese, shredded
• 2 tablespoons low-moisture mozzarella cheese, shredded