Almost-Instant Pierogi

Directions

1. 1
   Cook potatoes in boiling water until tender.
2. 2
   Drain and return to pot.
3. 3
   Add cheese to hot potatoes and mash until potatoes are smooth.
4. 4
   Add salt and pepper.
5. 5
   Melt butter in a large skillet. Add onions and cook 15 minutes until tender.
6. 6
   Heat oven to 350°. Have 2 (13 x 9-inch) baking dishes ready.
7. 7
   Spread half the onions over the bottom of baking dishes.
8. 8
   Stuff shells and arrange over onions.
9. 9
   Spread remaining onions over top.
10. 10
    Bake uncovered 15 to 20 minutes until heated through.