Place the chicken breasts in a freezer or zip-top bag and gently pound to an even thickness with a meat mallet or the side of a can.
In a bowl or measuring cup, whisk together olive oil, lemon juice, honey, minced garlic, garlic powder, onion powder, dried parsley, salt, black pepper, dried oregano, ground mustard, red pepper flakes, and chopped fresh basil (or dried basil if using).
Pour the marinade into the bag with the chicken, seal, and massage to coat. Marinate in the refrigerator 4–12 hours, flipping the bag occasionally.
About 15–30 minutes before cooking, remove chicken from the refrigerator and let sit at room temperature if time allows.
To pan-sear: heat a large nonstick skillet over medium-high until very hot. Add the chicken and cook undisturbed 3–5 minutes until well browned on the first side. Flip, cover, reduce heat to medium, and cook 5–7 minutes more or until the internal temperature reaches 165°F. Transfer to a cutting board and rest 5 minutes before slicing.
To grill: preheat and grease the grill to medium (about 400°F). Grill the chicken 5–7 minutes per side, undisturbed, until cooked through and 165°F internal. Let rest 5 minutes before slicing.
Slice the chicken and serve in pasta, salads, wraps, sandwiches, or pitas as desired.