PREHEAT oven to 350º F. Grease 11 x 7-inch baking dish.
MELT margarine in large skillet over medium heat. Add mushrooms, onion, garlic and Worcestershire sauce; cook, stirring occasionally, for 3 to 4 minutes or until mushrooms are soft. Beat cream cheese and eggs in large mixer bowl until creamy. Mix in evaporated milk, parsley, salt, and pepper. Stir in rice and mushroom mixture. Pour into prepared casserole dish.
BAKE for 35 to 40 minutes or until set and light brown around edges.