Mashed Potato and Carrot Casserole

Description
This recipe came from an estate sale. I obtained it when I purchased the family collection from the Henson Estate in Dallas, Texas in 1982.
 * Contributed by Catsrecipes Y-Group

Ingredients

 * 6 medium potatoes peeled and cubed
 * 1 white onion coarsely chopped
 * 6 medium carrots peeled and cubed
 * ¼ cup butter at room temperature
 * 1 teaspoon salt
 * 1 teaspoon freshly ground black pepper
 * 1 teaspoon parsley
 * ½ cup half and half
 * 1 egg slightly beaten
 * 2 teaspoons butter melted
 * parsley for garnish

Directions

 * 1) Cook and mash potatoes.
 * 2) Cook onion and carrot until soft then purée carrots and onion in food processor.
 * 3) Combine potatoes, carrot mixture, butter, salt, pepper, parsley, half and half and egg and pour into baking dish.
 * 4) Drizzle with melted butter and bake at 350°F for 40 minutes.
 * 5) Sprinkle with parsley and serve hot.