Preheat your oven to 375°F (190°C).
In a large bowl, combine the melted butter, lemon juice, lemon zest, minced garlic, thyme, rosemary, salt, black pepper, and red pepper flakes. Mix well.
Place the chicken thighs in a large baking dish, skin side up. Pour the lemon butter mixture evenly over the chicken, ensuring each piece is well coated.
Bake in the preheated oven for 45-55 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the skin is golden brown.
For extra crispy skin, broil the chicken for an additional 2-3 minutes at the end of baking.
Remove from the oven and let the chicken rest for 5 minutes before serving. Garnish with chopped parsley.