Enamel crock pot insert
Yes, though the insert can be harder to handle that a proper over casserole. The insert generally doesn't have nearly as prominent a lip or "handle area" as a standard casserole. Don't over heat the thing or cool it too quickly either, they are not made to the same "shock proof" standards as the best glass-ceramics.
Thank you for the response. I was concerned whether the enamel could handle the heat, so chickened out. Baked the dish in a faithful pot which fit into my crock-pot insert. Once I got to the "Boxing Day" party, filled the space around the pot with water, using it as a steamer and was able to keep the dish warm. The dish was a hit and I received many compliments.