Preheat oven to 425℉. Toss cauliflower florets with olive oil, paprika, garlic powder, salt, and pepper.
Spread evenly on a parchment-lined baking sheet and roast for 20-25 minutes until golden and tender, stirring halfway through.
While the cauliflower roasts, heat olive oil in a skillet over medium heat. Add ground turkey, breaking it apart with a spoon.
Add taco seasoning and chili powder, and cook for 6-8 minutes until browned.
Arrange roasted cauliflower on the same sheet pan. Top evenly with cooked turkey, shredded cheeses, tomatoes, jalapeños, and green onions.
Return the pan to the oven for 5-7 minutes, or until the cheese is fully melted and bubbly.
Sprinkle with fresh cilantro and drizzle with sour cream. Serve warm with guacamole, salsa, and lime wedges on the side.