Heat sauce while pasta is cooking. If sauce is already prepared, 4-5 minutes in a microwave, covered, works well.
Slice sausage into thin slices. Italian sausage and Gerhard's chicken/apple/chardonnay sausage work very well.
Cook mushrooms in two tablespoons of sherry in a microwave for 60 seconds or until moist.
Add a layer of sauce covering 90% of the diameter of the pasta. Place sausage rounds on top of the sauce. Optionally, add cooked mushrooms as well. Add a thick layer of grated mozzarella cheese, covering the sauce and sausage.
Microwave each serving for about 2.5-3 minutes on high. Cheese should be fully melted.
Extra portions can be refrigerated and reheated or frozen and reheated easily.