For added flavor, marinate the chicken breasts in olive oil, lemon juice, and herbs for 30 minutes before stuffing them. Ensure that the asparagus is cut into bite-sized pieces. Use a meat thermometer to check the internal temperature of the chicken, which should reach 165°F (75°C) for safe consumption. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days.