Preheat oven to 400 degrees Fahrenheit.
Brown your beef and onions with salt, pepper, garlic salt, and the spices. Drain the grease.
Add the tomato sauce. If you have time, let it simmer on low for an hour or so, but that's not mandatory.
Cook the macaroni in boiling water al dente. Drain and add the macaroni to the tomato sauce.
Let cool (if you have time), transfer it to a large baking dish and cover it with foil.
When ready to bake, cover with foil and bake at 400 degrees until it's hot (about 30-45 minutes depending on how cold it was when you started baking).
For the last 5 minutes or so, uncover, put cheese on top and cook for 5 minutes or so. Putting the oven on broil will make it nice and brown (but watch it carefully!)