Step 1

Cook the pasta in very salty water until al dente. Drain pasta and set aside.

Step 2

Return empty pasta pot to stove and turn the heat to medium.

Step 3

Add butter to pot and heat until just melted.

Step 4

Whisk flour into butter and let cook for 30 seconds.

Step 5

Slowly stream milk into pot, whisking constantly to break up any lumps of flour. Cook, whisking occasionally, until sauce has thickened and just begun to simmer, about 7-10 minutes.

Step 6

Stir chopped spinach, salt, and pepper into sauce and cook 1-2 minutes more until spinach has wilted.

Step 7

Remove sauce from heat.

Step 8

Add cream cheese and shredded parmesan cheese to sauce and stir until cheese has melted.

Step 9

Return cooked pasta to sauce and stir to coat. Serve immediately.