Preheat the oven to 300 degrees F (150 degrees C). Rinse pumpkin seeds in a colander. Spread out on paper towels and pat dry.

Put the pumpkin seeds in a plastic bag along with the butter to coat.

Coat a large baking sheet with cooking spray and spread the pumpkin seeds out in a single layer. Sprinkle the chosen seasoning evenly over the tops.

Bake for 30 minutes in the preheated oven, stirring occasionally, until dry and toasted. Cool for a few minutes before serving.