Preheat oven to 350°F. Lightly coat a baking sheet with the butter; set aside.
After carving a fresh pumpkin, remove seeds from the pumpkin pulp. Place the pumpkin seeds in a colander and rinse several times under cool running water until all stringy pulp is gone. Rinse seeds once more, and let the colander stand in sink (about 5-10 minutes) to let the water drain out.
In a bowl combine salt, garlic powder and seasoning salt. Add seeds and toss until all seeds are well coated.
Place the pumpkin seeds on the buttered baking sheet. Bake in a 350°F oven for about 15 minutes or until seeds are a light golden brown. Let cool completely before enjoying.