Step 2
Drain the cooked pasta, return pan to stove, and turn heat to low. Place the butter in the pan and melt. Add the onion and cook for 30 seconds to 1 minute. Add the pasta and stir to coat the pasta with the butter. Add the cheeses (including the cream cheese) and stir until the cheese is melted. Add the pasta water, a little at a time, until a desired consistency is reached (you may not use all the pasta water). Season with salt and pepper and serve immediately (with additional shredded cheese on top if desired.) Serve as a main dish with a big green salad on the side or as a side dish (alongside rotisserie chicken makes a quick weeknight meal!)