Macaroni and cheese, broccoli, and tuna casserole

Mike and I have a thing for "white trash" food. I don't say that to be derogatory, it's just our way of describing comfort food that is very far from fancy. This is one of our favorites, which we had for dinner tonight. It's easy and was good on a cold night like tonight.

Macaroni and Cheese, Broccoli, and Tuna Casserole

Ingredients:
(all amounts are approximate and to taste)
1 large package Stouffer's frozen macaroni and cheese
broccoli
1/2 cup onion, chopped (I use the pre-chopped onion you can get from the grocery.)
2 cans tuna, packed in water
shredded cheddar cheese (about 1 cup)
1/2 cup sour cream
1 Tbs. butter or olive oil or combination of both

Directions:
Assemble all ingredients in a 1 quart casserole dish.
Cut broccoli into bite-sized pieces. Steam in pot or in microwave until tender, but not soft (mushy broccoli is gross!). Put in casserole dish.
In a small pan, melt butter and saute onion over low heat until soft and transluscent, about 5 minutes. Add to the casserole dish.
While those are cooking, prepare the macaroni and cheese in the microwave according to the package directions.
Drain the tuna and add to the broccoli and onions.
Add the macaroni and cheese when it is done cooking.
Mix everything thoroughly.
Add the sour cream and mix until incorporated.
Press noddle mixture gently into the dish until top is smooth. Top with shredded cheese.
Bake at 375 degrees until cheese is melted and brown on top, approximately 15 minutes. Watch carefully to prevent burning.

I bake this in our toaster oven and it works very well, but I'm sure it would be fine in the regular oven, too. It might take a bit longer, so just watch for when the cheese looks as done as you like it.