Cracker Barrel's Hashbrown Casserole

• 2 hash browns (frozen thawed)
• 2 cps cornflakes (crushed)
• 475 ml sour cream
• 230 gr cheddar cheese (shredded)
• 170 gr margarine melted
• 60 gr onion (chopped)
• 3 gr salt
• 1 package cream of chicken soup condensed