Preheat the oven to 400 degrees F.
Spray with cooking spray a baking dish that would fit the chicken breasts. Set aside.
Season the meats generously with salt and pepper on both sides.
Place a large pan over medium-high heat, and add olive oil. Once the oil is hot, add the chicken and cook for 3-5 minutes on each side, or until nicely browned.
Transfer the chicken to the prepared baking dish.
In a small bowl, mix together the rosemary, lemon zest, melted butter, garlic, chicken broth, and lemon juice. Pour the butter mixture over the chicken.
Bake for 25 minutes or until chicken is cooked through. The chicken is done when it reads at least 165 degrees F when checked with a meat thermometer inserted in the thickest part of the meat.
Spoon the sauce over the chicken, sprinkle with parsley, garnish with lemon slices and rosemary sprigs and serve.