So flavorful – gotta try this ASAP!

- 1 Pound Ground Italian Sausage
- 1 Pound Penne Pasta
- 1 Tablespoon Olive Oil
- 1/2 Yellow Onion Minced
- 2 Cloves Garlic Minced
- 1/2 Teaspoon Red Pepper Flakes
- 1/2 Teaspoon Salt
- 2 Cups Heavy Cream
- 5 Ounces Baby Spinach
- 1 Cup Shredded Parmesan Cheese