Preheat your air fryer to 300°F (150°C).

In a medium bowl, toss the pumpkin seeds with olive oil, salt, pepper, garlic powder, paprika, and cinnamon (if using). Ensure the seeds are evenly coated.

Spread the seasoned pumpkin seeds in a single layer in the air fryer basket. Avoid overcrowding; work in batches if necessary.

Air fry for 8-12 minutes, shaking the basket halfway through. Cooking time may vary depending on your air fryer and desired level of crispiness.

Keep a close eye on them after 8 minutes, checking for doneness. The seeds should be golden brown and crispy.

Once cooked, remove the pumpkin seeds from the air fryer and let them cool completely on a wire rack or paper towel-lined plate. This helps them crisp up further.

Store your crispy pumpkin seeds in an airtight container at room temperature for up to a week.