Ham and Potato Soup

Ingredients:

4 cups peeled and diced thin-skinned red or white potatoes (not baking potatoes such as Russets, Idaho, etc)
4 cups very flavorful homemade chicken stock
1 tablespoon dried parsley
1 bay leaf
6 tablespoons butter, divided
1/3 cup diced celery
1/3 cup finely chopped onion
3-4 cups diced cooked ham
5 tablespoons all-purpose flour
1/2 teaspoon Kosher salt
1 teaspoon ground black pepper
2 cups milk

Source, details, tips and full instruction at: butteryum