I just made a HUGE batch of stuffing to serve about 100 people for a Thanksgiving dinner at work tomorrow. I used challah bread, butter, onions, carrots, celery, sage and chicken broth, and some salt and pepper but it seems to be lacking in flavor. Unfortunately, I'm not able to put it in the turkey. Any suggestions on how to spice up the recipe a bit and add more flavor? It seems to be lacking.