Preheat the oven to 300°F (150°C).

Rinse the pumpkin seeds thoroughly to remove any pumpkin flesh. Pat dry with a clean towel.

In a mixing bowl, combine the cleaned pumpkin seeds with olive oil, sugar, cinnamon, salt, and nutmeg if using. Mix well until evenly coated.

Spread the seasoned seeds in a single layer on a baking sheet lined with parchment paper.

Roast the seeds in the preheated oven for 20 to 25 minutes, stirring them halfway through.

Once the seeds are golden and crunchy, remove them from the oven and let cool before serving.