Filling:
4 large potatoes
4-5 slices American cheese
1 1/2 tbsp butter
Dough:
1/2 C milk
1/2 cake yeast
1/2 tbsp butter
1/2 tbsp sugar
1/4 C warm water
3 C flour
1 egg yolk, slightly beaten
1 tsp salt
Scald 1/2 C milk. Add butter and sugar and heat until butter is melted. Take small a mount of mixture, cool slightly and crumble yeast into mixture. Let stand in warm place for about 10 mins. Add dissolved yeast mixture to remaining milk mixture. Sift flour into salt and add egg, yeast mixture and warm water. Knead well. Cover and place in warm place to rise until doubled (about 2 hours). Divide dough into two portions and turn out on floured board. Cover each portion and let rest for 10 mins. One piece at a time, turn over onto hand and flatten in center. Place filling in center and draw up edged, pinching together to seal. Cover and let rest for 10 mins. Roll out slowly to 12" circle and bake at 375 for 10 mins, then turn over and bake for 10 mins. When done, wrap in damp cloth and let stand for 10 mins.
When ready to serve, cook slices in butter until softened.