Chicken with Mandarin Orange and Water Chestnut Sauce

In small saucepan, combine mandarin oranges, water chestnuts, brown sugar, vinegar, soy sauce and cornstarch dissolved in 1/4 cup water. Cook until mixture becomes clear and thickens, about 4 to 5 minutes, stirring occasionally. Remove from heat. In large skillet, bring broth to a simmer. Pound chicken breasts with meat mallet to 1/2-inch thickness. Place chicken in skillet; cover and simmer over medium-low heat about 8 to 10 minutes or until chicken is no longer pink in center. Remove chicken from poaching liquid. Place on serving platter. Heat sauce if needed; spoon sauce over chicken.