Creamy Ham Potato and Corn Chowder

cooked ham (, diced into small cubes (I used left over ham roast, ham steak works too))

slices bacon (, cooked and crumbled)

butter (, divided)

medium yellow onion (, diced (1 1/2 cups))

carrots (, peeled and diced (3/4 cup))

celery stalks (, diced (3/4 cup))

low-sodium chicken broth

medium red potatoes ((1 3/4 lb), diced into 3/4-inch cubes)

dried oregano

dried thyme

bay leaf

Salt and freshly ground black pepper (, to taste)

fresh corn kernels ((or frozen))

+ 2 Tbsp all-purpose flour

milk

sour cream or heavy cream ((I've tried and like both versions))

Chives for topping