Add PAMA, ketchup, brown sugar, lime juice, salt, chipotle, dried mustard, garlic powder, onion powder, and black pepper to blender and process until smooth. Pour into a small saucepan over medium heat. Bring to a boil, reduce heat, and simmer about 20 minutes or until reduced by about 1/3. Cool completely.
In a large mixing bowl, add beef, fresh cilantro and 1/3 cup of cooled PAMA sauce. With hands, gently combine then form into 6 patties.
Grill burgers about 3-5 minutes per side over medium heat (or cook in pan on stovetop) or until desired doneness. During the last minute of cooking top each burger patty with 2 slices of cheese to melt.
Assemble burgers by spreading some of the remaining sauce on the cut sides of the toasted rolls. Top bottom parts of rolls each with a burger patty, spinach, red onion, and top part of roll.
SNAPPY TIPS: If you like spicy food, consider adding more chipotles to the sauce.SNAPPY SUBSTITUTIONS: Instead of Monterrey Jack cheese you can use white cheddar or your favorite cheese. Instead of spinach you could substitute lettuce.