Savory Italian Sausage with Creamy Pumpkin Rigatoni One-Pot Dinner

Ingredients

• 400 g (14 oz) Italian sausage, casings removed
• 1 medium yellow onion, finely chopped
• 3 cloves garlic, minced
• 400 g (14 oz) unsweetened pumpkin purée
• 2 cups baby spinach (optional)
• 120 ml (½ cup) heavy cream
• 50 g (½ cup) grated Parmesan cheese, plus more for garnish
• 350 g (12 oz) rigatoni
• 750 ml (3 cups) low-sodium chicken broth
• 120 ml (½ cup) water
• 1 tsp dried sage
• ¼ tsp ground nutmeg
• ½ tsp dried chili flakes (optional)
• Salt, to taste
• Black pepper, to taste
• 2 tbsp olive oil