For an extra layer of flavor, marinate the chicken in the mustard-lime mixture for at least 30 minutes, or up to overnight, in the refrigerator. Adjust the amount of jalapeno pepper in the salsa according to your preference for spice. Serve with your favorite sides, such as rice, quinoa, or roasted vegetables, to create a complete and balanced meal. Leftover baked chicken and salsa can be stored separately in airtight containers in the refrigerator for up to 3 days. Reheat the chicken before serving and add the fresh salsa just before serving.