Make the Marinade: In a blender or food processor, combine lime juice and zest, olive oil, garlic, cilantro, salt, pepper, and optional cumin or paprika. Blend until smooth.

Marinate: Place the chicken in a bowl or zip-top bag. Pour the marinade over the chicken, making sure it's fully coated. Marinate at least 30 minutes or up to overnight.

Cook: Skillet method - sear over medium-high heat 3-4 minutes per side, then reduce heat and cook through. Skillet + oven - sear 2-3 minutes per side, then transfer to a 400°F oven for 7-10 minutes. Grill - preheat to medium-high and grill 5-6 minutes per side until internal temp is 165°F.

Rest + Slice: Let chicken rest 5 minutes, then slice or chop as desired.