Slow Cooker Italian Summer Soup

Ingredients

• 2 lbs ground Italian sausage
• 2 carrots, chopped
• 2 stalks celery, chopped
• 1 white onion, diced
• 1 bell pepper, diced
• 2-3 small zucchinis, diced
• 1 (15.5 oz) can diced tomatoes
• 1 (15 oz) can cannellini beans, drained and rinsed
• 4 cups chicken or vegetable broth
• 1 tablespoon garlic powder
• 1 tablespoon Italian seasoning
• 1 teaspoon red pepper flakes
• Salt
• black pepper
• ¾ cup shredded parmesan cheese for serving