We're going to be serving a version of this burger in slider size at this year's Feedback concert during our annual trip to the South by Southwest festival in Austin.
In a medium bowl, season the beef with salt and pepper. Mix in the chorizo. Form into 6 patties (thinner in the centers for even cooking). Heat a cast-iron skillet or griddle pan over medium-high. Add the oil, one turn of the pan. Add the patties. Cook, turning occasionally, until cooked through, about 8 minutes.
Meanwhile, in a medium saucepan, toss the grated cheeses and cornstarch. Heat over medium. As the cheeses begin to melt, whisk in the milk. Season with the granulated garlic, granulated onion, and cumin. Stir the chiles, cilantro, and scallions into the queso.
Build the burgers with the roll bottoms, the pickles, mustard, lettuce, patties, queso, tortilla chips, pickled jalapeños, and the roll tops.