Preheat oven to 350. Put crackers in a gallon sized ziplock bag, seal and crush with a rolling pin. Melt butter (or butter substitute). Dip chicken in butter, and then dip and shake in the ziplock bag, coating with crushed crackers. Place in a single layer in a 9x13 baking dish. Bake for 30-35 minutes, or until juices run clear and cooked through.