Step 1

Cook the penne pasta in a large pot of salted boiling water according to package directions.

Step 2

While the pasta is cooking, heat the olive oil in a large skillet over medium-high heat.

Step 3

Cook the Italian sausage along with the onion, garlic, red pepper flakes, and salt until the sausage is no longer pink.

Step 4

Drain excess fat from the skillet if necessary and return the meat mixture to the pan.

Step 5

Turn the heat to low and add the cream to the skillet. Bring to a simmer and add in the spinach.

Step 6

Cook, stirring for about 3 minutes until the spinach is wilted.

Step 7

Stir in the parmesan cheese until melted.  Stir the pasta into the sauce.

Step 8

Serve immediately.