Step 1

Cook the pasta in a large pot of salted boiling water according to package directions.  When the pasta is finished cooking, reserve about 1/4 cup of the pasta water, then drain the rest.

Step 2

While the pasta is cooking, melt TWO TABLESPOONS of the butter in a large skillet over medium-high heat.  Add the sliced mushrooms and cook for 4-5 minutes until they have started to turn golden brown.

Step 3

Add the minced garlic to the pan along with the salt and pepper.  Cook and stir constantly for one more minute.

Step 4

Turn the heat to low and add the remaining two tablespoons of butter, the pasta, reserved pasta water, and parmesan cheese.  Toss with tongs to coat.

Step 5

Taste the pasta and season more to taste if necessary.  Serve immediately.