Heat the butter in a large skillet over medium-high heat. Add the quartered mushrooms to the hot pan and let them sit for 2 minutes before stirring them.
Stir them well with a spatula, then let them continue to cook for 3-4 more minutes, or until golden brown.
Add the minced garlic and cook, stirring constantly, for 1 minute. Add the soy sauce to taste, then mix to coat evenly.