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Keto Chicken Alfredo Casserole - Creamy, Comforting, and Low-Carb

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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 6 servings
Ingredients Method

Ingredients
  

  • 3 cups cooked chicken, shredded or cubed (rotisserie works great)
  • 1 large head of cauliflower, cut into small florets (about 5–6 cups) or 4 cups broccoli florets
  • 2 tablespoons butter
  • 3 cloves garlic, minced
  • 1 1/2 cups heavy cream
  • 4 ounces cream cheese, softened and cubed
  • 1 cup grated Parmesan cheese (plus more for topping)
  • 1 cup shredded mozzarella (for topping)
  • 1/4 teaspoon nutmeg (optional but classic in Alfredo)
  • 1/2 teaspoon onion powder
  • 1/2 teaspoon Italian seasoning (or dried parsley + oregano)
  • Salt and black pepper, to taste
  • 2 tablespoons olive oil (for roasting the cauliflower)
  • Fresh parsley, chopped, for garnish (optional)

Method
 

  1. Preheat and prep: Heat the oven to 400°F (200°C). Grease a 9x13-inch baking dish. Line a sheet pan with parchment.
  2. Roast the cauliflower: Toss florets with olive oil, salt, and pepper. Spread on the sheet pan and roast for 18–22 minutes, until fork-tender with a little color. This keeps the casserole from getting watery.
  3. Warm the chicken: If using cold, cooked chicken, chop or shred it now. Set aside in a large bowl.
  4. Make the Alfredo sauce: In a medium saucepan over medium heat, melt butter. Add garlic and cook 30–60 seconds, until fragrant. Pour in heavy cream and bring to a gentle simmer.
  5. Thicken and season: Add cream cheese and whisk until smooth. Stir in Parmesan, nutmeg, onion powder, Italian seasoning, salt, and pepper. Simmer 2–3 minutes until thick and silky. Taste and adjust seasoning.
  6. Combine: Add roasted cauliflower and chicken to the large bowl. Pour the Alfredo sauce over the top and toss to coat evenly.
  7. Assemble: Transfer the mixture to the prepared baking dish. Sprinkle mozzarella and a bit more Parmesan over the surface.
  8. Bake: Reduce oven to 375°F (190°C). Bake for 15–20 minutes, until the cheese is melted and bubbling around the edges.
  9. Broil for color (optional): Broil 1–2 minutes to brown the top. Watch closely.
  10. Finish and serve: Let it rest 5–10 minutes to set. Sprinkle with chopped parsley and serve warm.