My family loves this recipe and I always get requests for it. A great way to get your kids to eat veggies! I've made this almost every Thanksgiving and/or Christmas since about 1997!
I usually use about 1/2 a cup or more of cheese. I like to use different types and also to sprinkle it on top. I've never even used the pimiento, and regular onion works just fine. There are many types of frozen vegetable mixes, so choose your favorite!
(Some garlic and a little extra seasoning to taste doesn't hurt either.)