01 - Preheat oven to 400°F. Lightly grease a large baking dish with cooking spray or oil.
02 - Arrange sliced onions and half the lemon slices evenly across the bottom of the prepared baking dish.
03 - Pat chicken breasts dry with paper towels and arrange on top of the onion and lemon bed.
04 - In a small bowl, whisk together olive oil, melted butter, minced garlic, oregano, thyme, salt, and black pepper until well combined.
05 - Brush or spoon the herb butter mixture evenly over all chicken breasts, ensuring full coverage.
06 - Pour chicken broth around the sides of the baking dish, avoiding direct pouring over the chicken. Top each breast with remaining lemon slices.
07 - Cover dish tightly with aluminum foil. Bake for 25 minutes.
08 - Remove foil and continue baking for 15 additional minutes until chicken reaches internal temperature of 165°F and develops light golden color.
09 - Remove from oven and let chicken rest for 5 minutes. Sprinkle with fresh chopped parsley before serving.