Make the Lime Crema: In a bowl, whisk together sour cream (or Greek yogurt), lime juice, lime zest, garlic powder, salt, and pepper. Set aside.
Prepare the Mushrooms: Heat olive oil in a large skillet over medium-high heat. Add sliced mushrooms and sauté for 5-7 minutes until softened. Season with cumin, smoked paprika, salt, and pepper. Stir occasionally.
Assemble the Tacos: Warm the tortillas in a dry skillet or microwave. Spoon the cooked mushrooms onto the tortillas. Top with cilantro, red onion, and crumbled feta if desired.
Serve: Drizzle generously with lime crema. Serve immediately.
Notes
Vegan option: Substitute sour cream with cashew cream or a dairy-free yogurt.
For a spicier kick, add some sliced jalapeños or hot sauce.