1. Flatten chicken to ¼ inch thickness; sprinkle with salt and pepper.

2. In a small bowl, combine the crab, water chestnuts, bread crumbs, mayonnaise, parsley, mustard, 2 teaspoons marinade for chicken, and half of the onions.

3. Chop one cheese slice; stir into crab mixture. Spread over chicken; roll up and secure with toothpicks.

4. In a large nonstick skillet coated with cooking spray, brown chicken on all sides. Place seam side down in a shallow 3 qt. baking dish coated with cooking spray. Brush with remaining marinade for chicken.

5. Bake, uncovered, at 350° for 25 minutes. Cut each remaining cheese slice into six strips; place two cheese strips over each chicken breast. Bake 5 to 10 minutes longer or until a meat thermometer reads 170°. Discard toothpicks. Sprinkle remaining onions over chicken.