Austin Diner Style Queso

Name: Austin Diner-Style Queso
Ingredients: 2 tablespoons unsalted butter; 1/4 cup diced yellow onion; 4 jalapeños, seeded and finely diced; 2 cloves garlic, minced; 2 Anaheim chiles, roasted (see above note), peeled, seeded, and finely diced; 2 tablespoons cornstarch; 1 cup whole milk; 1 cup water; 1 pound white or yellow American cheese, shredded; 2 tablespoons chopped fresh cilantro; 1 teaspoon ground cumin; 1/4 teaspoon cayenne; 1/2 teaspoon kosher salt; Guacamole (for topping); Pico de Gallo (for topping); Tortilla chips (for serving)