Making the Pumpkin Pasta Sauce is simple if you follow these easy steps:

1. Prepare the Ingredients: Gather all your ingredients and have them ready to go.
2. Sauté Onions and Garlic: In a large skillet, heat the olive oil over medium heat. Add the chopped onions and cook until they are translucent. This should take about 5-7 minutes. Add minced garlic and cook for another 1-2 minutes until fragrant.
3. Add Pumpkin: Stir in the pumpkin puree, mixing well with the onion and garlic.
4. Incorporate Cream: Gradually add the heavy cream to the pumpkin mixture, stirring constantly until it’s well combined and creamy.
5. Season: Add the ground sage, nutmeg, salt, and pepper to taste. Allow the sauce to simmer for about 10-15 minutes on low heat, stirring occasionally.
6. Finish with Cheese: Once the sauce is heated through, stir in the grated Parmesan cheese until melted and thoroughly mixed.
7. Adjust Consistency: If the sauce is too thick, you can add a splash of pasta water to reach your desired consistency.
8. Serve Immediately: Remove from heat and set aside while you cook your pasta.

These steps will guide you in the straightforward process of making this incredible sauce.