Preheat your oven to 350°F (175°C). Prepare a baking dish by greasing it lightly with cooking spray or olive oil.
In a large pot, bring water to a rapid boil. Carefully add the cauliflower florets and cook for about 5-7 minutes, or until they are tender but still slightly firm. Drain the cauliflower and set it aside to cool.
In a spacious mixing bowl, add the shredded chicken, buffalo sauce, softened cream cheese, half of the shredded cheddar cheese, ranch dressing, diced celery, and sliced green onions. Stir vigorously until the ingredients are thoroughly combined into a smooth mixture.
Take the drained cauliflower and gently fold it into the chicken mixture, ensuring the florets are well coated and evenly distributed. Taste the mixture and season with salt and freshly cracked black pepper as needed.
Transfer the combined mixture into the greased baking dish, spreading it out evenly. Top with the remaining shredded cheddar cheese and, if desired, sprinkle breadcrumbs over the cheese for an extra crunchy texture.
Place the baking dish in the preheated oven and bake for about 25-30 minutes, or until the casserole is bubbly and the top is beautifully golden brown.
Once baked, remove the casserole from the oven and let it sit for a few minutes to cool slightly. Before serving, garnish with freshly chopped parsley for a pop of color and freshness.
Notes
Serve with extra buffalo sauce and ranch dressing on the side.