Mashed Potato Casserole
["8 large Russet potatoes (about 4 1/2 to 5 lb.)", "1 (8 oz.) pkg. cream cheese", "1 c. sour cream", "2 tsp. garlic salt", "1/2 tsp. pepper", "1/4 c. butter or margarine"]
["In large pot, boil potatoes until tender.", "Drain and mash well.", "In small bowl with electric mixer, beat cream cheese and sour cream until smooth.", "Gradually add cream cheese mixture to potatoes, beating until smoothly blended.", "Beat in garlic salt and pepper.", "Turn mixture into a buttered shallow 3 or 4-quart casserole dish.", "Dot with butter or margarine.", "Cover with lid or foil.", "Bake covered in 400\u00b0 oven until heated through (50 to 60 minutes).", "Yields 12 to 15 servings."]
["potatoes", "cream cheese", "sour cream", "garlic salt", "pepper", "butter"]