Kartopliana nachynka (potato-cheese filling for varenyky)

6 md Potatoes; 5 Large May Be
           -Used
      2 lg Onions; 3 May Be Used If You
           -Love Onions
    1/2 c  Oil; OR
    1/4 lb butter; 1 Stick
      1 c  Cheddar Cheese; Shredded OR
      1 c  Dry Bryndzia (Sheep's Milk
           -Cheese) *
      2 ts Salt
      2 ts Ground Black Pepper
 
  * This may be substituted with a goat's milk cheese such as feta
  Peel and quarter the potatoes, cover with water, and cook until soft.
  Meanwhile, cook the chopped onions in melted butter until golden.
  Drain and rice the potatoes.  Shred the cheddar cheese or crumble the
  bryndzia. Add the onions, cheese, salt and pepper to the potatoes,
  blending well. Allow to cool, stirring occasionally.  This filling
  may be refrigerated for 2-3 days but not frozen.
  NOTE: Leftovers may be used to make breakfast cakes or a a filling for
  potato skins, stuffed in green peppers, or into rolled cabbage leaves.