Preheat oven to 350 deg (F). In a mixing bowl, combine the cheeses. Spray a 9"x13" casserole dish lightly with cooking spray. Spread a little (1/8-1/4 C) of the pasta sauce in the bottom, and then layer some of the dry noodles in a single layer across. Pour 1/3 of the remaining pasta sauce on top, then top with 1/3 of the spinach and 1/3 of the cheese mixture. Add another layer of noodles, and repeat until all of the noodles, sauce and spinach are gone (the last, top, layer should be cheese!)

Cover tightly with aluminum foil, and bake for 45 min - 1 hour until the noodles are soft and the cheese and sauce are hot and bubbly.

Round out this meal with a green salad and some whole wheat garlic bread.