Oh well, since you are asking... But I wouldn't tell anyone else!
Take note that the numbers are ok for our glass baking dish, roughly 2 liters big. So, you need:

- Pack of spaghetti
- 250 ml of Baking Cream (12% one)
- truckload of cheese (Really, lots of cheese!)
- 30 decagrammes of ham
- a butter
- an onion(optional)

First, cut the onion and meat into small pieces, and grid the cheese. When you're done with that, grab a frying pan, put a piece of butter on it and put it on stove - let it melt.
Boil roughly half the pack of spaghetti until they're done and while you're waiting, fry the ham on butter and when it's nearly finished, add the onion to it. At the end, add baking cream and fry it for a bit more. Just don't burn anything and you're ok.

Turn on your oven on some of the middle-ish temperatures, let it heat up - I can't really be precise on the temperature since we're making it in gas oven.

Now, take the spaghetti and cover the bottom of the baking dish with some of them. Then pour some of the ham-mixture on them, until THEY are covered (don't use it up thou, you're gonna make at least another row!), and then cover that with grinded cheese. And put more spaghetti on that and basically repeat until you run out of resources / space in baking dish - we usually manage to fit 2 rows in ours. When that's finished, cover the baking dish and put it in the oven. Let it bake for about 25 minutes (However, we DO have a gas oven. Check it in between at least a few times so you don't end up with a crisp...) and voila, you have the best pasta EVER. It's also incredibly fat... Just saying.