Preheat oven to 450 degrees. Line two large baking sheets with parchment.
In a food processor, crush the tortilla chips until very fine crumbs. The result should be about 1 1/2 cups of crushed chips. If needed, add more to create the necessary amount.
Add the chili powder, cumin, paprika, oregano, cayenne pepper, and a pinch of salt and pepper. Process until combined. Pour the crushed chips into a bowl.
In a second large bowl, whisk the eggs. Drop in the cauliflower florets and toss with the eggs until fully coated. Working one or two at a time, turn the cauliflower in the tortilla chip mixture to cover, shaking off excess. Set on the prepared baking sheet and repeat until all cauliflower florets are used up. Rinse off your hands if they become too crusty with chip dust. Yum.
Drizzle the wings with olive oil. Bake 20-22 minutes, turning once halfway in cooking time, until crispy and golden all over.
To make the crema, add the avocado, yogurt, lime juice, and salt to a food processor. Blitz until smooth. You can also do this by hand by mashing the avocado very well and mixing with the remaining ingredients.
Serve the cauliflower with green onions, hot sauce, and crema.