Preheat oven to 425°. Spray rimmed baking pan with nonstick cooking spray.
In large zip-top plastic bag, combine cornmeal, flour, Old Bay seasoning, basil, oregano and salt. Seal bag and shake until well combined. In medium bowl, whisk together onion, Dijon mustard, honey and lemon juice.
Dip 2 chicken breasts into mustard-honey mixture to coat, then place in bag with cornmeal mixture. Seal bag, pressing out excess air. Shake bag to evenly coat chicken; transfer chicken to prepared pan. Repeat with remaining chicken, mustard-honey mixture
Bake chicken 20 to 25 minutes or until internal temperature reaches 165°.