Filled Sandwiches

1 lb hamburger
1 can cream of mushroom soup
onion (I use onion flakes)
1 1/2 c grated cheese
1 dozen hard rolls

Brown hamburger and onion. Add cream of mushroom soup, then add cheese until melty. Cut open hard rolls and hollow out center. Put mixture inside and wrap in foil. Bake for 15 min. at 350 deg.