Recipe - Stuffed Baked Potatoes With Cheese Sauce

4 lg Potatoes
One half cup Milk
2 tablespoon Butter or margarine
One half teaspoon Salt
1 Egg yolk
Cheese Sauce
2 tablespoon Butter or margarine
2 tablespoon Flour
One half teaspoon Dry mustard
One fourth teaspoon Salt
Dash Pepper
Dash cayenne
1 cup Milk
1 cup Grated sharp Cheddar cheese
(One fourth lb)

1. Preheat oven to 425øF. Scrub potatoes; pierce each with a fork.
Place on oven rack; and bake until forktender 50 to 60 minutes. 2.
Remove potatoes from oven. Cool slightly; split in half lengthwise.
Gently scoop out potato, keeping shells intact. Turn potato into a large
bowl. Set 6 shells on a baking pan; discard remaining shells. 3. In
saucepan, heat milk and butter slowly until butter meltsdon't let mixture
boil. 4. With portable electric mixer, beat potato until smooth. Add salt;
gradually beat in warm milk mixture. Add egg yolk, beating well until
mixture is light, fluffy and smooth. Spoon potato mixture into shells,
making a swirl at the top. Return to oven. Bake 10 minutes, or until hot.
5. Meanwhile, make cheese sauce: In small saucepan, slowly heat butter;
remove from heat; stir in flour, mustard, salt, pepper, cayenne and milk
until smooth. 6. Before serving, spoon cheese sauce over top of each
potato. Makes 6