Cheesy Baked Gnocchi, Italian Sausage and Vegetable Casserole

Ingredients

• 2 Tbsp canola oil
• 4 Italian sausages
• 1 medium onion, (diced)
• 2 medium red peppers, (chopped)
• 2 medium zucchini, (chopped)
• 2 garlic cloves, (minced)
• 1 tsp Italian seasoning
• 1/2 tsp salt
• 1/4 tsp black pepper
• 19 oz can crushed tomatoes
• 1/2 cup reduced-sodium chicken broth or water
• 1 1/2 tsp dry mustard powder
• 1 tsp brown sugar
• 16 oz package potato gnocchi
• 1 cup ricotta cheese
• 2 cups shredded mozzarella cheese
• 2 tsp chopped parsley, (for garnish (optional))