Step 1

Place a rack in middle of oven; preheat to 400°. Toss mushrooms, oil, lime juice, oregano, onion powder, garlic powder, cumin, coconut sugar, salt, and cayenne in a medium bowl until mushrooms are well coated. Spread mushrooms out in a single layer on a parchment-lined baking sheet and roast until golden brown and crisp, 20–25 minutes.

Step 2

Build tacos with tortillas, mushrooms, salsa, vegan sour cream (if using), radishes, tomatoes, and cilantro. Serve with lime wedges for squeezing over.