Prepare the marinade by combining the apricot jam, balsamic vinegar, grain mustard, olive oil, chopped rosemary, salt, and black pepper in a bowl.
Marinate the chicken in the mixture, ensuring it is well coated.
Preheat the oven and grease a baking pan with olive oil.
Place the marinated chicken in the prepared pan and roast in the oven until fully cooked.
Serve the roasted chicken with a side salad.
