Potato Casserole

1 chopped medium onion            1/2 stick margarine

2 pounds frozen hash browns      
1 can cream of chicken soup     
1 can cream of mushroom soup            
6 -oz grated chedder cheese
2 cups sour cream  
6 -oz velvetta or american cheese grated

1/2 cup crushed crackers 
1/2 stick butter                     
Brown onion in butter and put in the bottom of larger baking dish.

Mix soups, chedder cheese and sour cream. 
Add to the hashbrowns and mix well; 
put in baking dish. 
Grate velvetta and sprinkle on top. 
Saute crushed crackers in 1/2 stick butter; sprinkle on top. 
Chunck 1 stick of margarine on top. 

Bake 1-1/2 hours at 325 deg F.