Thanks for sharing this recipe. I made this for dinner yesterday and my roommate who does not even like cauliflower at half of the casserole. The mustard adds a nice kick.
Well, I am rating it 4 stars based on the adults preferences. The kids did not go for the mustard flavor. I reduced the mayo a bit and added some broccoli. May try again and reduce the mustard or try something else! :) Thanks.