Cheeseburger Chili Mac and Cheese

Like I said earlier, my camera is not working properly right now and is making it difficult to take pictures of the meals we've been eating lately. This recipe I got from Rachael!
My kids LOVED THIS! I was a little sceptical at first, but they asked to have it for lunch the next day! I'd say that's a success!

the goods:

2 T. EVOO

1 1/2 lbs. lean ground sirloin

1 large onion, finely chopped

2 T. chili powder

salt and ground black pepper

1/2 c. ketchup

1/4 c. yellow mustard

1-2 c. beef stock (depending on how liquid-y you want it)

1 lb. whole wheat elbow macaroni

1 1/2 c. shredded sharp yellow cheddar (sharper the better!)

1. Preheat broiler. Bring a large pot of water to a boil over high heat for the pasta.
2. Place a medium pot over medium-high heat with 2 turns of teh pan of EVOO, about 2 T. Add the meat to the pan and cook until golden brown, 5-6 minutes.
3. Add the onion and chili powder to the pan, season with salt and pepper, and cook until the onion is tender, 4-5 minutes. Add the ketchup, mustard and beef stock to the pot, bring up to a bubble and simmer until sightly thickened, 4-5 minutes.
4. While the chili is working, salt the boiling water and drop the pasta in. Cook to al dente according to package directions. Then drain thoroughly and return it to the pot.
5. Add chili to the pot with the pasta and give everything a good toss. Transfer to a casserole dish and top with the shredded cheese. Place the casserole under teh broiler to melt and brown the cheese. Serve with a simple salad alongside.