01 - Whisk together olive oil, chili powder, cumin, garlic powder, smoked paprika, salt, pepper, and lime juice in a medium bowl. Add butterflied chicken breasts and turn to coat evenly. Let marinate for at least 15 minutes.
02 - Heat grill pan or skillet over medium-high heat. Cook marinated chicken for 5-6 minutes per side until internal temperature reaches 165°F. Transfer to cutting board and rest for 5 minutes before slicing into strips.
03 - Slice bolillo rolls in half horizontally. Lightly toast cut sides if desired for added texture.
04 - Spread ½ tablespoon mayonnaise on each roll bottom. Layer ½ tablespoon refried beans over mayonnaise for traditional creaminess.
05 - Layer sliced grilled chicken, avocado, tomato, red onion, shredded lettuce, and pickled jalapeños on each prepared bottom half. Top with fresh cilantro if using.
06 - Place top halves on sandwiches and press gently. Serve immediately with lime wedges and extra jalapeños on the side.