Make sure your seeds are free of any pumpkin bits and are completely dry - patting them down with a paper towel if necessary.
You can add the oil in one of two ways: add the seeds to a bowl and mix them with the oil, or place the seeds directly on a lined baking tray and drizzle with the oil. Either way works great - and the second method saves on dishes!
Sprinkle the pumpkin spice onto the seeds and roast for 5-10 minutes until the seeds take on a golden color. Stir halfway through to ensure even roasting.
If adding salt, sprinkle it on after you've removed the seeds from the oven.