Michael Symon's Pasta with Mushrooms and Sage (and Sausage)

So Michael Symon came out with a new 5 in 5 cookbook, so of course I bought it as soon as possible :).  This is one of the first recipes we tried out of his new cookbook, and although we made slight changes, this is pretty close to the original recipe.  We love us some 5 in 5 around here!  Obviously, we can't have a vegetarian meals around here, so we added Italian sausage to the mix, which was a huge hit.  Aaron gave this a perfect 10, Noah, Jonah and I gave it a 9, and Owen gave it an 8.  Each serving, with the sausage, was 558 for six servings.  Here's what we did:

12 oz Italian sausage, cooked and sliced and set aside

1 lb pasta
1 T olive oil
8 oz (more or less) mixed mushrooms, I used cremini, porcini and oyster
3 T unsalted butter
3 T chopped fresh sage
1 c freshly grated Parmesan cheese, plus more for serving

Boil the pasta in well salted water until al dente, then reserve 1 c of the pasta water, drain the pasta and set aside.
Over medium high heat, heat the oil and cook the mushrooms, about 3 minutes.  Flip the mushrooms, add the butter, and cook until the butter melts.  Stir in the sage and season with salt and pepper.
Add the pasta and reserved pasta water and cook, stirring until blended.  Remove from the heat, stir in the cheese and sausage, and serve with more cheese.