Brie and Apple Chicken Breasts

4 boneless breasts, pounded thin,
1/2 cup minced onion
1 small apple, peeled and minced
1/4 cup brie
1/4 cup shredded Cheddar cheese

Sauté apple with the onion until soft. Combine with brie and Cheddar. Place mixture on center of each breast, fold in sides and roll up. Place seam side down and bake at 350 degrees F until juices run clear - about 35 minutes.