D.B.
Red sauce. Have you considered throwing the frozen spinach right into the sauce? I do that all the time for a one dish meal, maybe with a crusty bread on the side. Spinach goes well with mushrooms and/or lemon too. You can also thaw the spinach and put it in a crock with some butter or lemon, and heat through in the oven, adding a little Parmesan cheese for the last few minutes - go light since you have cheese in the tortellini.
For the chicken sausage, just serve it with the leftover tortellini.
Have you tried recipes.com or one of those websites?