For a while I was addicted to the pumpkin seeds you can buy at the convenience store, but they're very salty and fattening, so I quit.
At Halloween, though, I'm entitled to indulge in the output of my jack-o-lantern. A dash of Worcestershire, a sprinkle of salt, a glug of olive oil. Mix it all in with the seeds, then spread them on foil on a cookie sheet in a 400-degree oven. (Don't worry about cleaning up the seeds; the goopy stuff turns crispy and tasty, too.) After 10-15 minutes, give them a stir, then keep roasting them until they are golden brown (another 5-10 minutes). You need to keep close watch; they can burn really quickly.