On medium, heat oil in large pan coated with cooking spray. Add onion and minced garlic saute 5 minutes. Combine thyme and 1/4 tsp salt. Sprinkle over chicken. Add chicken to pan. on medium/ medium-low heat, slowly cook chicken until it is until golden brown. Remove from skillet and keep warm. Reduce heat to medium-low/low. Add 1/4 tsp salt, raspberry preserves, vinegar, pepper, and brown sugar, and chopped raspberries. Stir constantly until preserves melt and everything is well mixed. Spoon over chicken. Serve.