A bold, cheesy, and satisfying low-carb casserole made with roasted cauliflower, shredded chicken, and zesty buffalo sauce. One dish, big flavor, and ready in 45 minutes.
Preheat oven to 400 degrees F (200 degrees C) and grease a 9×13 inch baking dish.
Toss cauliflower florets with olive oil, garlic powder, salt, and pepper. Spread on a baking sheet and roast for 15 to 20 minutes until tender and lightly browned at the edges.
In a large bowl, combine roasted cauliflower, shredded chicken, buffalo sauce, ranch dressing, and diced celery. Stir until evenly coated. Taste and adjust buffalo sauce level here.
Transfer the mixture to the prepared baking dish and spread evenly. Do not pack tightly.
Top with shredded cheddar cheese and blue cheese crumbles if using. Optional: sprinkle panko mixed with melted butter over the top for extra crunch.
Bake for 15 to 20 minutes until cheese is melted, bubbly, and golden at the edges.
Let rest for 5 minutes, garnish with sliced green onions, and serve warm.
Notes
Always roast the cauliflower before assembling – skipping this step leads to a watery casserole.
If using frozen cauliflower, thaw completely and pat very dry before roasting.
Assemble without cheese topping and refrigerate up to 24 hours ahead. Add cheese just before baking.
For extra crunch, mix panko breadcrumbs with melted butter and sprinkle over the cheese layer before baking.