Cut corn tortillas into triangles, fry in vegetable oil until crisp, and season with salt.
Prepare nacho cheese sauce by making a roux with butter, flour, then whisking in milk and cheeses until smooth. Season to taste.
Prepare guacamole, blister cherry tomatoes, char corn, and slice Serrano chilies and red onion.
Assemble nachos in layers: chips, beef mixture, nacho cheese, cherry tomatoes, corn, red onion, Serrano chilies, cilantro, and repeat.
Top with dollops of guacamole, sour cream, and more cilantro.
Serve and enjoy the gourmet nachos with various toppings.
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