Ingredient:

• 6 large potatoes, peeled and quartered
• 1 package (8 ounces) cream cheese, softened
• 1 cup shredded cheddar cheese
• 1/2 cup sour cream
• 1/3 cup chopped onion
• 1 large egg
• 2 teaspoons salt
• 1/2 teaspoon pepper
• Additional shredded cheddar cheese, optional