Pre-heat oven to about 400 degrees. (give or take a few degrees depending the oven).
Combine the lemon juice, molasses, worcestershire sauce, garlic and brown sugar. Mix well. Add chicken breasts, and marinade in the fridge for about 1 1/2 -2 hours. Turn the chicken about halfway through the marinade process.
Spray cooking spray into a casserole dish. Remove chicken from marinade, reserving the rest of the marinade. Place the chicken into the dish, and cover with the rest of the marinade.
Place into the oven, and bake until juices inside the chicken run clear. Remove from oven, and serve.