Italian Vegetable Popover Pizza

Ingredients

• 3 tablespoons vegetable oil, divided
• 2 cups sliced zucchini
• 1/3 cup chopped green bell pepper
• 1 cup sliced carrots
• 1 pound mushrooms, sliced
• 1/3 cup diagonally sliced celery
• 1/2 cup chopped broccoli
• 2 cups homemade tomato sauce or 2 cans (8 ounces each) tomato sauce
• 2 tablespoons tomato paste
• 1/2 cup red wine
• 1 tablespoon chopped fresh oregano or 1 teaspoon dried oregano
• 1 tablespoon chopped fresh basil or 1 teaspoon dried basil
• 3/4 teaspoon chopped fresh marjoram or 1/4 teaspoon dried marjoram
• 1 clove garlic, chopped
• 3/4 teaspoon salt, divided
• 12 ounces mozzarella cheese, shredded
• 2 large eggs
• 1 cup milk
• 1 cup all-purpose flour
• 1/2 cup grated Parmesan cheese