This is one of our favorite recipes for the holidays. I follow the directions with one adjustment - I use equal amounts of parmesan and cheddar (we love cheese!). It's not a very healthy recipe but it's good once or twice a year as a treat for the holidays. We never have a problem with the mayo not melting down. Just make sure you MIX the cheese, mayo, mustard, etc. together very well before spreading it on top. I've also made this without steaming the veggies first and it works if you bake it longer. I've also omitted cauliflower when we didn't have it and it still turns out great with just the broccoli. Have used both reduced fat and regular mayo, and I like it better with regular, just a tip. I'm also a "seasoner" and hate bland recipes - I always add a touch of something to spice it up - but with this, I've never had to. It's very flavorful if you follow the directions and use the right ingredients. Don't substitute the dijon or the green onions!! :-)
I tried this recipe but it needs some help. I started by making it exactly as written except that I substituted caramelized onions for the green onions since I didn't have any. I used low fat mayo, but regular cheese (not reduced fat). The mayonnaise just sat on top of my broccoli and tasted like mayonnaise. After 25 minutes in the oven, I had what amounted broccoli with a heap of mayo on it and some crunchy breadcrumbs. It was disgusting...so, I added a few tablespoons of half and half to smooth it out and then stirred the mayo topping and the veggies all together and put some fresh bread crumbs on the top so that I would get a crunchy topping. I put it back in the oven for another 10 minutes until it was bubbly and then turned on the broiler. That helped... lost all of that goopy mayo taste and texture, the cheese blended in with the mayo and made a really good sauce. I actually ate two servings after I fixed it.
I have no words for this. It was A-M-A-Z-I-N-G!! Tasty, creamy, crispy, everything! And on top of that, you get your veggie servings!
I used broccoli only, full-fat products, and 1 teaspoon dry mustard since I was out of Dijon. It was very good. Hubby, who is not a vegetable fan, ate two large helpings. . I will be making this again.
I agree with the reviewer below who noted that the cheese and mayonnaise didn't melt down to create a nice sauce. I used half low-fat sour cream and half low-fat mayonnaise, but it sort of stayed in a thick spread on top, and the whole casserole was too sweet. I'll eat it because I made it and because broccoli and cauliflower are good for you, but that's about it.
I used sour cream except for one tablespoon of mayo and thought that turned out great. I really like this as a different way to serve vegetables. Next time, I think I'll use a little cream cheese as well and cut the dijon down a bit as my husband found it to be a little bit strong.