Cheesy One Pot Tortellini and Sausage with Garden Veggies

Ingredients (13)

• 1 Tablespoon olive oil
• 1 yellow onion, chopped
• 1 teaspoon minced garlic
• 8 ounces sliced mushrooms, chopped
• 1 small zucchini, chopped
• 1 lb. sweet Italian sausage
• 1 can diced tomatoes with their juices
• 1 cup chicken broth
• 15 ounce can marinara sauce
• 20 ounces three cheese tortellini
• 1/2 teaspoon oregano
• 2 cups baby spinach
• 1 1/2 cups low fat shredded mozzarella