Add beef, chorizo, queso fresco, cilantro, cumin, chiles in adobo, garlic powder, egg and a large pinch of salt and pepper. Use your hands to combine everything together, but be careful not to over mix. Gently form 4-6 burgers patties from the burger mixture and set them aside. Heat about a tablespoon oil large saute pan over medium heat. Toast buns in batches, placing the cut side down in the oil. Cook for 1-2 minutes or until the cut side of the bun is crisp and slightly. golden brown. Set aside. Heat 1-2 tablespoons oil a large saute pan over medium-high heat (or heat a grill over medium-high heat and oil grates). Cook burgers for about 3-4 per side or until they form a dark brown crust on each side.