Preheat over to 325 degrees. Chop clumps roots off of mushrooms and rinse quickly. Separate mushrooms into individual strands and dry thoroughly. Spread mushrooms out in an even layer on a baking sheet lined with parchment paper or a silicone baking mat. Sprinkle with spices. Roast for 15 minutes, and then rotate baking sheet. Roast for another 15-20 minutes, or until mushrooms are deep golden-brown and dried.