Preheat Oven: Set your oven to 375°F (190°C).
Prepare Cauliflower: Toss cauliflower florets with olive oil, salt, and pepper. Spread on a baking sheet and roast for 20 minutes until tender and slightly browned.
Mix Sauces: In a large bowl, combine cream cheese, sour cream, garlic powder, onion powder, and paprika.
Combine Ingredients: Add roasted cauliflower to the sauce mixture. Stir in half of the cheddar and Parmesan cheeses.
Bake: Transfer to a baking dish. Top with remaining cheeses and bacon bits. Bake for 20 minutes until bubbly and golden.
Garnish and Serve: Sprinkle with fresh chives before serving.