Preheat the oven to 350ºF. Rinse the pumpkin seeds in a colander and remove any remaining pumpkin flesh that may be attached to the seeds. Place the washed pumpkin seeds in a lint-free dishcloth and pat dry (the seeds have a slippery coating and may not feel totally dry).
Place the washed and dried pumpkin seeds in a bowl and add the cooking oil and seasoning. Stir until the seeds are well coated. Pour the seasoned pumpkin seeds out onto a baking sheet lined with parchment paper, and spread them into a single layer.
Roast the pumpkin seeds in the preheated oven, stirring every 5-10 minutes, until they are golden brown and have a nutty aroma. Total roasting time will vary depending on the size of the seeds and their moisture level. Allow the pumpkin seeds to cool, then enjoy!