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