Preheat oven to 400 degrees and line a baking sheet with parchment paper.
In a large bowl, toss cauliflower with avocado oil. In a small bowl, combine spices (salt through garlic powder). Evenly season cauliflower with spice mixture, toss to combine, then transfer to the baking sheet. Bake for 20 to 25 minutes or until cauliflower is fork tender.
While cauliflower cooks, Make the Avocado Crema. Combine all ingredients in a blender or food processor and combine until smooth and creamy. If mixture is too thick, add more lime juice. Taste and season accordingly with salt.
When cauliflower is done, serve on tortillas with the Avocado Crema drizzled on top.