In small bowl, combine mayonnaise, lime juice, peppers, adobo sauce and garlic; salt and pepper to taste; set aside. Salt and pepper ground beef to taste; form into 12 mini-patties.
Prepare grill to medium heat. Grill burgers, turning once, 6-8 minutes or until internal temperature reaches 160°F.
Meanwhile, in small skillet over medium heat, cook fried onions until golden brown (about 1-2 minutes).
Top each patty with 1/3 slice cheese; remove from grill and place on buns. Top with chipotle mayonnaise and fried onions.
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