Sprinkle chicken with 1/8 teaspoon salt and pepper. Heat a large nonstick skillet coated with cooking spray over medium heat. Add chicken; cook 13 minutes or until done, turning occasionally. Remove from pan; keep warm.
Combine remaining 1/8 teaspoon salt, orange juice, broth, marmalade, and mustard in a bowl; stir well.
Recoat pan with cooking spray, and place over medium-high heat. Add garlic; sauté 1 minute. Add orange juice mixture; bring to a boil over high heat. Cook 6 minutes or until slightly thick, stirring constantly. Spoon sauce over chicken, and sprinkle with green onions.