Preheat the oven to 350 degrees. Combine the water, garlic powder, herbs, Worcestershire, onion powder, salt, and cayenne in a medium saucepan and simmer over low heat for 10 minutes. Add the pumpkin seeds and cook for five minutes, stirring occasionally.
Drain the pumpkin seeds and place on a large baking sheet. Bake for 10-15 minutes, stirring occasionally, until the seeds are crisp. Store in an airtight container.