Preheat and prep: Set the oven to 400°F (200°C).
Lightly grease a 9x13-inch baking dish with cooking spray or a little oil.
Roast the cauliflower: Toss the cauliflower florets with 1 tablespoon olive oil, a pinch of salt, and pepper. Spread on a sheet pan and roast for 15–18 minutes, until lightly golden on the edges. This step builds flavor and prevents a watery bake.
Cook the chicken: While the cauliflower roasts, heat 1 tablespoon olive oil in a skillet over medium-high heat.
Season the chicken with salt, pepper, and half the ranch seasoning. Sauté for 5–7 minutes until just cooked through and lightly browned. Remove from heat.
Make the creamy ranch sauce: In a bowl, whisk together cream cheese, Greek yogurt (or sour cream), the remaining ranch seasoning, garlic, and broth (or milk).
Stir until smooth. If it’s too thick, add a splash more liquid. Taste and adjust salt and pepper.
Combine in the baking dish: Add the roasted cauliflower and cooked chicken to the prepared dish.
Pour the ranch sauce over the top and toss gently to coat everything evenly.
Add the cheese: Sprinkle 1.5 cups of the shredded cheddar evenly over the mixture. Reserve the remaining 1/2 cup for later.
Bake: Place the dish in the oven and bake for 15 minutes, until bubbling around the edges.
Finish with a cheesy top: Pull the dish out, sprinkle the remaining cheddar, paprika, and bacon crumbles (if using) on top. Bake 5–7 more minutes, until the cheese is fully melted and a little toasty.
Garnish and rest: Let the bake rest for 5 minutes.
Sprinkle with sliced green onions and a pinch of red pepper flakes if you want a touch of heat.
Serve: Spoon into bowls or plates. It’s great on its own, or with a simple side salad for contrast.