I didn't have swiss cheese or green onions but used a 4-cheese mexican blend, white onion and fresh thyme. It still was delicious.

I wanted to experiment a little with this, so I did three versions in little pans. First I did as directed, then I made one with crumbled precooked bacon and then I made one adding 1 teaspoon dried tarragon. My bacon loving husband thought the bacon overwhelmed the flavors and I agree. Our favorite was the one with the added tarragon though the original was a very close second. The only thing I wish I would have done was to double the caramelized onions. They really make this dish special.I might also throw in an extra teaspoon of grainy dijon to add a little more mustard flavor because it really is an understated flavor in this lovely dish. I used a gruyere instead of a swiss and ooh lala! Thanks so much for sharing this wonderful recipe.

Very tasty! I didn't have the green onions or the dijon mustard but I had everything else and I added broccoli and a bell pepper and it turned out quite yummy! The sugar you use when you saute the onion gives it a really nice flavor! This is definitely a keeper. :)

I made this Christmas morning and it was liked by everyone. I cut down the dijon to 1 tsp (my mom does not like spicy mustard), and also used about 1.5 cups of red onion instead of 2. I omitted the green onion because I didn't have any on hand. My dad is a huge meat eater and didn't miss it at all. Thanks!