In a medium bowl, mix the chopped chipotle peppers, lime juice, garlic powder, and cilantro to create the marinade.

Place the chicken breasts in a resealable bag or shallow dish and coat with the marinade. Refrigerate for at least 30 minutes (or overnight for deeper flavor).

Preheat your grill to medium-high heat (375°F). Remove chicken from marinade and grill for 6-7 minutes per side until it reaches an internal temperature of 165°F.

Add cheese slices during the last minute of grilling to melt.

Toast burger buns on the grill until golden brown.

Assemble the burgers by layering avocado slices on the bottom bun, followed by grilled chicken and red onion slices. Top with another bun.