Heat the olive oil in a sauté pan over medium heat. Add the shiitake mushrooms and cook, stirring occasionally, for 2-3 minutes. Add the snow peas and cook, stirring occasionally, for 3 minutes. Add the minced garlic and cook, stirring constantly for 1 minute. Add the butter and soy sauce and cook until melted and veggies are evenly coated with sauce. Add freshly cracked black pepper, to taste. Serve immediately. Enjoy.