In a large saucepan, place the Chicken Broth, Diced Celery, Diced Onions, Garlic Salt and White Pepper. Cook over high heat for 10 minutes, or until the mixture reduces and thickens slightly.
In a blender or food processor, place the Broth and the Cubed Velveeta Cheese. Puree them together until the mixture is smooth. Return the pureed mixture to the saucepan and simmer it for 5 minutes. Add the Diced Jalapeno Peppers and mix thoroughly.
Serve with a dollop of Sour Cream and a warm Flour Tortillas.