Cooking mushrooms for pasta is simple. My preferred method is to sauté them, here are a few tips to keep in mind: 1. Make sure they are dry before you start - Any moisture will make them steam instead of caramelizing. 2. Do not slice them too thin - You want them to hold their shape, and if you slice them too thinly, as they cook they will shrivel down to nothing. They should be sliced no thinner than 1/4-inch (closer to 1/2-inch thickness is good). 3. Don't overcrowd the pan - Spread them in a single layer, so they get a beautiful golden brown.