Preheat the oven to 375 degrees Fahrenheit and prepare a 9x13 inch baking dish by spraying it with cooking spray.
Using a mallet or rolling pin, flatten each chicken breast until it is 1 inch thick on all sides.
Salt and pepper the chicken breasts and then lay them out evenly in the prepared baking dish. Take care not to overlap them.
In a medium mixing bowl, whisk together the vegetable oil, apricot preserves, fish sauce, honey, orange juice, and rosemary until combined.
Pour the apricot mixture over the chicken and bake in the oven for 30-35 minutes or until the chicken reads 165 degrees Fahrenheit on a meat thermometer and juices run clear. The bake time will vary depending on the size of the chicken breast.
Once fully cooked, take the chicken out of the oven and let it rest for 5 minutes.
Plate and serve with a chopped parsley garnish, optional.