Use a sharp knife to cut the top of the pumpkin off, large enough to scrape out the inside, or in half.
Use your hands or a spoon to scoop out the seeds on the inside. Pour seeds into a colander. Rinse the seeds under the sink with water. Pick out the seeds and pulp, separating the two and discard the pieces you don't want. Spread the seeds on several paper towels, pat to dry and you have clean seeds.
If you want to proceed to bake them to crispy snacks you'll want to put them into a pot of boiling salted water. Keep them inside this on a consistent rolling boil for about 3 minutes or until your seeds float. Use a slotted spoon to get them out.
Lay out some new, dry, paper towels and pour them on top. Press down to absorb the excess moisture. To get them as crispy as possible you want them as dry as much possible. Ideally let them sit overnight but a minimum of 4 hours.
Once dried pour them into a bowl and toss with olive oil or melted butter and seasonings, toss to coat. If you want to bake them, pour on to a non stick baking sheet. Preheat oven to 350 degrees F. Roast for about 20 minutes flipping them over halfway until crispy. Allow to cool completely before enjoying so they can continue to get crispy as they dry.