Season chicken, if desired, with salt and ground black pepper. Grill or broil chicken until chicken is thoroughly cooked; set aside.
Meanwhile, melt Spread in 12-inch nonstick skillet over medium heat and cook onions, stirring occasionally, 10 minutes or until very golden; keep warm.
Just before serving, toss greens with Wish-Bone® Red Wine Vinaigrette Dressing. Arrange greens on 4 serving plates, then top with chicken, sliced, and warm onions. Sprinkle with cheese and, if desired, cracked black pepper.