Potato and Shrimp Soup

I got this recipe from my Relief Society the other day; haven't tried it yet, but it looks yummy.

Ingredients
7-8 large potatoes, peeled and diced
2 lb. bag of raw shrimp (pre-cooked gets too mushy)
1 med. onion, chopped
2 stalks of celery, diced
1 Tbs garlic, minced
2 Tbs butter
1 pint half and half
1 cup milk
3 cups chicken broth
Tony's seasoning salt

Directions
(1) Sprinkle shrimp with garlic and Tony's seasoning salt. Let sit in fridge for a few hours.
(2) In a large pot, combine potatoes, celery, onion, and chicken broth and cook on med-high heat until tender.
(3) Add half and half and milk and make a thickening with flour or cornstarch. Add to soup until broth is nice and thick.
(4) Add shrimp and cook until pink.