Heat oven to 400 F. Grease pie plate, 10x1 1/2 ". Cook and stir ground beef, mushrooms, onion and garlic in skillet until beef is brown. Drain. Spread in plate. Beat remaining ingredients until smooth, 15 seconds in blender on high or 1 minutes with hand beater. Pour into plate. Bake until knife inserted in center comes out clean, 30-35 minutes. Garnish with parsley. 6-8 servings.