meatballs in potato cups

Ingredients For meatballs in potato cups

• 2 c

  leftover mashed potatoes
• 1

  egg
• 1/2 sm

  onion, finely chopped
• 1

  celery stalk, finely chopped
• 2/3

  lb. lean ground beef
• 1/2 c

  quick-cooking oats
• 1/3 c

  nonfat dry milk
• 1/2 tsp

  salt
• 1/4 tsp

  pepper
• BOUILLON GRAVY:
• 1 Tbsp

  butter or margarine
• 2 Tbsp

  all-purpose flour
• 1 c

  water
• 1 tsp

  beef bouillon granules
• 1/2 tsp

  bottled browning sauce,optional