Season chicken, if desired, with salt and ground black pepper.
In 12-inch nonstick skillet, melt margarine over medium-high heat and cook chicken 8 minutes or until chicken is thoroughly cooked, turning once. Remove chicken to serving platter and keep warm.
In same skillet, stir in Knorr® Roasted Chicken gravy mix blended with water, orange juice and rosemary. Bring to a boil over high heat, stirring constantly. Reduce heat to low and simmer, stirring occasionally, 3 minutes. To serve, pour sauce over chicken. Serve, if desired, with hot cooked rice and garnish with orange slices.