Almost-Instant Pierogies

Directions

1. 1
   Combine potatoes and cheese together; mash until smooth.
2. 2
   Stir in salt and pepper; set aside.
3. 3
   Melt the margarine in a skillet; add in onions; stir/saute 10-15 minutes.
4. 4
   Spread half the onions in a 13x9-inch pan.
5. 5
   Stuff each pasta shell with potato mixture; arrange shells over onions.
6. 6
   Sprinkle remaining onions over shells.
7. 7
   Bake in a 350°F oven for 20-25 minutes.