This is very simple to make. You can make it ahead of time and stick it in the fridge for later (cooks for an hour). I don't know if it can be frozen or not, but I don't see why not - as long as you leave the potato chips off!
What you need:
1/2 package of cooked spaghetti
1-2 onions, depending on size
1 can of mushrooms (feel free to use fresh)
2 cans of diced tomatoes
1 handful of broken potato chips (I'm sure you can find a use for the rest of the bag :-) )
salt and pepper to taste
Cook the spaghetti according to the directions on the package (or however you normally make it)
While the spaghetti is cooking, put the beef in a pan to brown.