Shrimp Chowder

I got this recipe here at My Recipes

2 TBS butter or Margarine
1 medium chopped onion (I just use some dry onions)
2 (10.75 oz) cans of Cream of Potato Soup (undiluted)
3 1/2 cup milk
1 cup shredded Monterrey jack cheese
1 1/2 lbs medium shrimp
1 can chopped carrots
1 can chopped potatoes
(Options to make it into more of a sea food chowder)
(optional) can of clams
(optional) scallops
(optional) chopped tilapia