Cheesy Vegetable Chowder

Name: Cheesy Vegetable Chowder
Ingredients: 1/2 cup onion, chopped; 1 clove garlic, minced; 1 cup celery, sliced; 1 cup carrots, sliced into coins; 1 cup potatoes, cubed; 3 1/2 cups chicken stock ((use vegetable stock for vegetarian soup)); (1) 17- ounce can corn, drained; 1/4 cup butter; 1/4 cup all-purpose flour ((use gluten-free flour for a gluten-free soup)); 2 teaspoons mustard powder; 1/4 teaspoon white pepper; 1/8 teaspoon paprika; 2 cups whole milk; 1 1/2-2 cups American deluxe cheese, chopped