Season chicken thighs with sea salt on both sides and let rest while you prepare the chimichurri.
In a mixing bowl, combine parsley, garlic, olive oil, red wine vinegar, oregano, salt, black pepper, and red pepper flakes. Stir to blend.
Reserve a few spoonfuls of the chimichurri for serving.
Spoon the remaining chimichurri over the chicken thighs and marinate for 10–15 minutes (optional but recommended).
Heat a grill pan over medium-high heat and cook the chicken for 6–7 minutes per side until golden and cooked through.
Let the chicken rest for 5 minutes before slicing.
Drizzle with the reserved chimichurri sauce before serving.
Enjoy with sides like chimichurri rice or a chilled Matcha Lime Fizz.