Cheesy Mashed Potatoes
["6 large potatoes, peeled and quartered", "1 (8 oz.) pkg. softened cream cheese", "1 c. shredded Cheddar cheese", "1/2 c. sour cream", "1/3 c. chopped onion", "1 egg", "2 tsp. salt", "1/2 tsp. pepper", "additional shredded Cheddar cheese (optional)"]
["Place potatoes in a large saucepan; cover with water. Cover and bring to boil. Cook for 20 to 25 minutes or until very tender; drain well. In mixing bowl, mash potatoes. Add cream cheese, Cheddar cheese, sour cream, onion, egg, salt and pepper; beat until fluffy. Transfer to a greased 2-quart baking dish. Cover and bake at 350\u00b0 for 40 to 45 minutes or until heated through. Sprinkle with additional cheese, if desired. Yield: 10 servings."]
["potatoes", "cream cheese", "Cheddar cheese", "sour cream", "onion", "egg", "salt", "pepper", "Cheddar cheese"]