I made this and Chad and I really liked it quite a bit.
Adding thickening agents directly to boiling liquid creates lumps rather than a smooth base. Sautéing the finely chopped onion and minced garlic in three tablespoons of butter over medium heat provides the fat necessary to hydrate the two tablespoons of all-purpose flour during a strict one-minute cooking phase. This brief par-cooking step eliminates the raw flour taste before any broth enters the vessel.
A heavy-bottomed stockpot or Dutch oven measuring at least six quarts is mandatory here to prevent scorching when the dairy elements are introduced. Heavy cast iron or thick-clad stainless steel distributes heat evenly across the base, stopping the high volume of half-and-half and cream of chicken soup from burning against the bottom during the fifteen-minute simmer over low heat.
Starch degradation ruins the structural integrity of the final bowl if proper holding procedures are ignored. Crumbled tortilla chips must remain separate until service and should be placed directly into individual serving bowls rather than stirred into the pot, preventing the masa from dissolving into an unappealing mush.
Leftovers require rapid cooling within two hours before transfer to airtight containers, lasting up to four days in the refrigerator. Reheating should occur gently over medium-low heat to prevent the Monterey Jack and sharp cheddar cheeses from breaking their emulsions and separating into pools of oil.