1. Season the chicken with salt. Dredge in flour and transfer to a nine- x 13-inch (20- x 30-centimeter) baking dish.
2. Spray the bottom of a small saucepan with cooking spray and heat garlic, ginger, red pepper flakes, if using, and zest until very fragrant but not brown (30 seconds).
3. Add mandarin juice, soy sauce, and honey. Bring to a boil.
4. Pour over chicken and bake uncovered for 40 minutes.
5. Preheat the oven to 350 degrees Fahrenheit.