Season with butter and salt; shake in a container.
Preheat oven to 300F (convection or air fryer)
Spread seeds out on a baking sheet
Add more salt, if desired.
Bake for 45 minutes
Notes
If the seeds are a bit soft after being roasted, take them out of the oven or air fryer and let them set until they are cold. The moisture will naturally release. You can then return them to the oven (air fryer) for another 10 to 20 mins to get them to the final crispness.