OK - this is the quickest and easiest (and cheapest) recipe I know (and kid-friendly). I'll post another, more gourmet recipe later. This is a more healthy (although salt-laden) alternative to macaroni and cheese:
8 oz uncooked elbow macaroni (Mueller's makes a box in this size)
2 14.5 oz cans of diced tomatoes (semi-drained)
Pepper to taste
4 oz of Velveeta, diced (I've tried many cheeses, this one works the best)
Boil the macaroni in a large saucepan according to package directions. While it is draining, return the pan to the stovetop.
Add the tomatoes and pepper. Bring to boil and simmer for about 3 minutes.
Add the macaroni back into the pan and mix all together.
Turn heat off (keep pan on stove) and add the Velveeta. Stir until melted.
Take the pan off the heat and let sit for awhile (the longer this sits, the more the pasta can absorb the sauce).
Serve with a salad.