Preheat oven to 350 degrees F. Cut chicken breasts into cubes. Cut each bacon slice into thirds. Stir together brown sugar and chili powder. Dredge chicken in mixture. Wrap each chicken cube with bacon and secure with a wooden pick. Dredge wrapped chicken in mixture again. Coat a rack and broiler pan with nonstick cooking spray. Place chicken wrap on rack in broiler pan. Bake 350 for 30 to 35 minutes or until bacon is crisp.