*Coat a large skillet with cooking spray. Add oil. Place over medium-high heat until hot. Add chicken; cook 3 minutes on each side or until browned.

*Add tomatoes, green onions, and jalapeno pepper. Bring to a boil; cover, reduce heat, and simmer 20 minutes or until chicken is tender. Transfer chicken to a serving platter, using a slotted spoon.

*Combine cornstarch and water; stir well. Add to tomato mixture in skillet, bring to a boil. Cook, stirring constantly, 1 minute or until slightly thickened. Spoon over chicken.