Preheat the oven to 350 degrees. Cook the noodles according to package directions. Drain and set aside.
In a skillet, over medium heat, cook mushrooms, onions and ground meat. Throw peppers in for a minute and then drain, if necessary. If you drained your meat mixture, return mixture to your skillet.
Add mushroom soup, tomatoes, cooked noodles, salt and pepper into your skillet. Sometimes I throw ½ cup of shredded cheese into the mixture and sometimes I don't. It is up to you.
Dump into a casserole dish. I usually use one that is 8x8 and 2 inches deep. Cover and bake for 40 minutes.
Uncover your casserole. Turn your oven up to broil. Sprinkle crispy fried onions all over the top of your casserole. Next, cover the crispy onions with shredded cheese.
Return your casserole to your oven and broil until your cheese is melted and as brown as you like it! Serve immediately and enjoy!