Preparation: Preheat oven to 350degrees F. In large saucepan, bring
to a boil the potatoes in water to cover. Reduce heat to low, cover
and simmer 20-30 minutes until fork tender. Drain and set aside.

In medium skillet, cook sausage until browned, stirring frequently to
break up, about 20 minutes. With slotted spoon, remove sausage to
bowl; set aside.

Add onion to drippings in skillet; cook about 5 minutes until soft,
stirring frequently. With slotted spoon, remove to bowl with sausage,
set aside.

In large bowl, with mixer at low, mix potatoes and egg yolk until
smooth. Fold in cheeses, parsley and sausage mixture. Spoon into
greased 9 inch pie plate. Bake 30-40 minutes until heated through,
remove from oven to wire rack to cool 5 minutes. To serve, cut pie
into wedges, garnish with the pepper slices.