In a bowl, whisk together harissa paste, honey, olive oil, minced garlic, lemon juice, smoked paprika, salt, and pepper until well combined.
Add chicken to the marinade and toss until well coated. Let sit for 15-30 minutes at room temperature (or up to 24 hours in the fridge for deeper flavor).
Heat a large skillet over medium-high heat. Add a drizzle of oil, then add marinated chicken. Sear for 4-5 minutes per side until golden, sticky, and cooked through (internal temperature should reach 165°F).
Remove from heat and let rest for 5 minutes before slicing. Spoon any extra pan sauce over the top before serving.
Preheat oven to 400°F. Line a baking sheet with parchment paper.
Mix marinade and coat chicken as described above.
Place marinated chicken on prepared baking sheet. Bake for 20-25 minutes until internal temperature reaches 165°F.
Optional: Broil for 2-3 minutes at the end for crispy, caramelized edges. Let rest 5 minutes before serving.