Preheat the oven to 400 F and spray two baking sheets with cooking spray
Shred the mushrooms by removing the cap with a sharp knife and slice thin, with a fork shred the stem of the mushroom into strips of varied sizes, some thin, some thick.
In a medium bowl combine dry spices, orange juice, salt and 4 tablespoons olive oil. Add in the shredded mushrooms and toss to coat, let marinate 15-20 min while the oven comes to temperature
Place the mushrooms onto the baking sheet and roast in the oven about 30-40 minutes until crispy and golden, stirring every 10 minutes. Check the mushrooms every 5 minutes starting at the 30 minute mark, once they are golden and crispy, they are done. Remove from oven and set aside.
Add lime juice and adjust seasoning with salt and pepper.
Serve in warm charred tortillas with chopped onion, cilantro, limes and magical green sauce.