Heat grill
In medium bowl, mix beef, salsa & bread crumbs.
Shape into 12- 4 inch patties, 1/4 inch thick. cheese in center of 6 patties, spreading slightly. Top with remaining patties; press edges together firmly to seal.
Place patties on grill over medium heat. Cover grill; cook 11-13 minutes, turning once, until thermometer in center of patty reads 160.
Place burgers on bottom halves of toasted buns; top each with tomato slice, avocado slice and 1T. sour cream.
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