Tuna Casserole

2 cans tuna
2 cups peas
2 cans cream of mushroom soup
1 onion, diced
1 (13 oz) can evaporated milk
1 (8 oz) pkg noodles, cooked
2 cups potato chips

Combine all ingredients and top with crushed potato chips. Bake at 400 degrees for 45 minutes.