For the Collard Green Slaw: In a large bowl, combine the collard greens, cabbage, red onion, radishes, cilantro, lime zest, lime juice and salt. Using your hands, massage the juice into the greens then stir to combine. Cover and refrigerate until ready to serve.Fort the Avocado Cream: In a blender or food processor (I used a NutriBullet), combine the avocado, lime juice, cilantro, a pinch of salt and a few tablespoons of water. Blend until smooth. Add more water to thin, as needed. The texture should be thick and creamy.For the Blackened Mushrooms: In a large skillet, warm the oil over medium heat. Add the mushrooms and the seasonings then stir until evenly coated. Cook for about 5 minutes, just until mushrooms are softened.Spread each tortilla with avocado cream then top with cooked mushrooms and collard slaw. Serve warm and enjoy!