Roasting them at a high temperature of 450 F for around 20 minutes will produce golden brown mushrooms that are crispy on the outside yet still tender on the inside.
Sauteeing your mushrooms on the other hand will create a delicious caramelization, but remember to let them cook and crisp in the pan on their own first over medium-high heat.
Mushrooms have a lot of liquid to release once they start cooking, so rather than sauté them in oil or butter immediately, a good tip is to dry sauté first.