Raspberry Balsamic Chicken

1 teaspoon vegetable oil
Cooking Spray
1/2 cup red onion, chopped
1/2 teaspoon dried thyme
1/2 teaspoon salt, divided
4 boneless, skinless chicken breast halves
1/3 cup seedless raspberry preserves
2 Tablespoons balsamic vinegar
1/4 teaspoon pepper

Heat oil in non-stick skillet coated with cooking spray over medium high heat until hot. Add onion and saute 5 minutes. Combine thyme and 1/4 tsp salt; sprinkle over chicken. Add chicken to skillet and saute 6 minutes on each side or until done. Remove chicken from skillet and keep warm. Reduce heat to medium-low. Add 1/4 tsp salt, preserves, vinegar, and pepper, stirring constantly until the preserves melt. Spoon sauce over chicken. Yield: 4 servings.