01 -
Cook the penne pasta in a large pot of salted boiling water according to package directions.
02 -
While the pasta is cooking, heat the olive oil in a large skillet over medium-high heat.
03 -
Cook the Italian sausage along with the onion, garlic, red pepper flakes, and salt until the sausage is no longer pink.
04 -
Drain excess fat from the skillet if necessary and return the meat mixture to the pan.
05 -
Turn the heat to low and add the cream to the skillet. Bring to a simmer and add in the spinach.
06 -
Cook, stirring for about 3 minutes until the spinach is wilted.
07 -
Stir in the parmesan cheese until melted. Stir the pasta into the sauce.
08 -
Serve immediately.