Finely mince the chipotle peppers. For less heat, remove seeds first.
Zest and juice the limes, ensuring no white pith is included in the zest.
In a food processor or blender, combine chipotle peppers, adobo sauce, lime juice, lime zest and olive oil. Pulse 5-7 times to create a primary emulsion.
Add minced garlic, brown sugar, cumin, oregano, salt, and pepper. Process for 30-45 seconds until fully emulsified.
Use immediately or store in an airtight container in the refrigerator for up to 5 days.
To use: Place 1.5-2 pounds of chicken in a non-reactive container, pour marinade over, and ensure complete coverage. Marinate boneless breasts for 2-4 hours, bone-in pieces for 4-6 hours.