1. Slice the corned beef brisket into thin strips, about ¼ inch thick.
2. In a large bowl, combine soy sauce, Worcestershire sauce, brown sugar, black pepper, garlic powder, and onion powder.
3. Add the beef strips to the marinade, ensuring all pieces are well coated. Cover and refrigerate for at least 4 hours, or overnight for best results.
4. Preheat your dehydrator to 160°F (70°C).
5. Arrange the marinated beef strips on the dehydrator trays, making sure they do not overlap.
6. Dehydrate the beef strips for 4-6 hours, or until they reach your desired level of dryness.
7. Once done, let the jerky cool completely before storing in an airtight container.