Very good, and very easy to make!
1/2 cup margarine or butter
1 onion, peeled and chopped (I used a small yellow onion)
1 green bell pepper, seeded and chopped
3 or 4 ribs celery, chopped
2 packages (10 ounces each) frozen chopped broccoli, thawed
8 ounces spaghetti, uncooked
10-12 ounces Cheddar cheese, grated (about 2 cups), divided (I just bought the shredded cheese in a bag, even though I have a grater, and it worked fine)
2 cans (10-3/4 ounces each) condensed cream of mushroom soup, undiluted
1/2 soup can milk
1 can (4 ounces) whole or sliced mushrooms, drained (the smallest can I could find was about 6 ounces, and it was fine)
Melt margarine in a large saucepan; saute onion, green pepper and celery. Put broccoli on top; cover and simmer 5-10 minutes.
Meanwhile, cook spaghetti according to package directions; drain.
In a buttered 3-quart casserole dish, layer spaghetti, vegetable mixture and 3/4's of the cheese. In a small bowl, combine soup and milk; pour over mixture in dish. Spread mushrooms on top. Sprinkle remaining cheese on mushrooms. Bake in preheated 350-degree oven 35-45 minutes, or until hot and bubbling.
Makes 10 servings (good for left-overs!)
Soups, Stews and Casseroles, various contributing editors, 1990