hearty italian sausage soup

Ingredients

• 1 pound italian sausage, sliced
• 1 - onion, chopped
• 2 cloves garlic, minced
• 1 teaspoon olive oil
• 2 cans (14 oz. each) 25%-less-sodium chicken broth
• 1 cup water
• 1 can (15 oz.) cannellini beans, rinsed
• 1 can (14.5 oz.) stewed tomatoes, undrained
• 1 cup rotini pasta, uncooked
• 1 1/2 cups baby spinach leaves
• 1/2 cup 2% milk shredded mozzarella cheese
• - saltine crackers
• 1 tablespoon oregano
• - salt & pepper, to taste