- Stir together chipotle adobo sauce and crema in a small bowl. Refrigerate until serving.
- Combine walnuts, mushrooms, cumin, chili powder, garlic, soy sauce and lime juice in a food processor. Pulse to break up walnuts and mushrooms into small crumbles.
- Heat olive oil over medium-low heat in a skillet. Add walnut mixture and cook, stirring occasionally for 7-8 minutes, until mushrooms are tender.
- Spoon walnut taco meat over tortillas topped with roasted corn, cotija, chipotle crema, cilantro, and lime wedges