Wash and dry the seeds. Put the pumpkin seeds in a colander, wash and remove any pulp left on the seeds, then let them dry.
Optional: If you are using any seasonings (see some ideas in the article), add them now so the seeds can soak it in with any remaining moisture. This allows the spice to coat the seeds evenly. A simple spice mix is two parts salt, one part ground pepper and one part smoked paprika.
Line a baking tray with parchment paper and place the seeds on it, and let them dry while your oven is heating up. Turn your oven to 350 F (180 C), no fan.
Depending on your preference and the seeds you used, let them roast in the oven for about 15-20 minutes, tossing them every 5 minutes. Let them cool off for a few minutes before serving.