Creamy Halibut Chowder

Name: Creamy Halibut Chowder
Ingredients: Unsalted butter, 2 tablespoons; Onion, 1 medium, diced; Carrots, 2 medium, diced; Celery, 2 stalks, diced; Garlic, 2 cloves, minced; All-purpose flour, 3 tablespoons; Chicken broth, 4 cups; Milk, 1 cup (whole or half-and-half for creamier texture); Potatoes, 2 medium, peeled and diced; Fresh thyme, 1 teaspoon, chopped; Bay leaf, 1; Salt, to taste; Freshly ground black pepper, to taste; Halibut fillets, 1 pound, cut into bite-sized chunks; Fresh parsley, 2 tablespoons, chopped (for garnish)