Cut mushrooms into 1/4-inch- thick slices.
Sauté half of garlic in half of oil in an electric or extra-large skillet over medium heat until tender. Add half of mushrooms and 1/4 cup parsley; cook 3 to 5 minutes or until tender and browned, turning once. Remove to a serving dish; sprinkle with half of salt and pepper. Repeat procedure; sprinkle with remaining 1/4 cup parsley, and serve immediately.
*3 pounds fresh mushrooms may be substituted. Do not slice; stir constantly during cooking.