They taste great raw or toasted as a snack. Also called pepitas, they add a delicate flavor and texture to many recipes.
Preheat oven to 350 degrees. In a medium bowl, combine pumpkin seeds, chili powder, cayenne pepper, coarse salt, and fresh lime juice; toss to coat. Spread on a rimmed baking sheet; bake until puffed and browned, about 10 minutes.
While baking them is a great way to make use of those pumpkin seeds leftover from carving, you can buy the seeds cleaned and packaged at the grocery store.