1886 Cafe and Bakery Cheese Soup

This recipe is hotel executive chef David Bull's adaptation of Texas cooking maven Helen Corbitt's original cheese soup. He likes it a bit spicier and he uses Velveeta, which melts beautifully. If you substitute Cheddar, which was called for in the original, be sure to grate it finely or it will not melt all the way.

1/4 cup butter
1/2 cup onion, minced
1/2 cup carrot, minced
1/2 cup celery, minced
1/4 cup flour
1 1/2 tablespoons cornstarch
4 cups chicken stock
4 cups milk
1/4 teaspoon baking soda
1 pound grated Velveeta or mild Cheddar
1 teaspoon dried parsley
1 dash cayenne or to taste
1 dash paprika or to taste
1 teaspoon salt or to taste
1 teaspoon white pepper or to taste

Melt butter in a heavy saucepan. Over medium-high heat, saut