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

If you love rich, creamy Alfredo but want to keep things low-carb, this casserole checks every box. It’s hearty, comforting, and still light enough to fit into a busy weeknight. Tender chicken and roasted cauliflower get blanketed in a velvety Alfredo sauce, then baked until bubbly and golden.

The flavor is familiar and cozy, with a keto-friendly twist that doesn’t feel like a compromise. Serve it with a crisp salad, and you’ve got dinner wrapped up.

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

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Prep Time 15 minutes mins

Cook Time 30 minutes mins

Total Time 45 minutes mins

Servings: 6 servings

Ingredients Method

Ingredients

  

• 1 large head cauliflower, cut into bite-size florets (about 6–7 cups)
• 2 tablespoons olive oil or avocado oil
• 1 teaspoon kosher salt, plus more to taste
• 1/2 teaspoon black pepper
• 1 teaspoon garlic powder (for the cauliflower)
• 3 cups cooked chicken, shredded or diced (rotisserie works great)
• 1 cup shredded mozzarella
• 1/2 cup grated Parmesan, divided
• 2 tablespoons chopped fresh parsley (optional, for garnish)
• 3 tablespoons butter
• 3 cloves garlic, minced
• 1 1/2 cups heavy cream
• 4 ounces cream cheese, softened and cubed
• 3/4 cup finely grated Parmesan
• 1/4 teaspoon nutmeg (optional, classic Alfredo note)
• 1/2 teaspoon salt, or to taste
• 1/4 teaspoon black or white pepper

Method

 

1. Preheat and prep: Heat your oven to 400°F (200°C). Lightly grease a 9x13-inch baking dish.
2. Roast the cauliflower: Toss florets with olive oil, salt, pepper, and garlic powder. Spread on a sheet pan and roast 18–22 minutes, until just tender and lightly browned at the edges. Don’t overcook; it will bake again.
3. Make the Alfredo sauce: In a large saucepan over medium heat, melt butter. Add minced garlic and cook 30–60 seconds until fragrant. Pour in heavy cream and bring to a gentle simmer.
4. Enrich and thicken: Whisk in cream cheese until smooth. Stir in Parmesan, nutmeg, salt, and pepper. Simmer 2–3 minutes, stirring, until velvety and slightly thick. Taste and adjust seasoning.
5. Assemble the casserole: In the baking dish, combine roasted cauliflower and chicken. Pour the Alfredo sauce over the top and toss gently to coat.
6. Add the cheese: Sprinkle mozzarella and half of the remaining Parmesan evenly over the casserole.
7. Bake: Reduce oven temperature to 375°F (190°C). Bake 15–18 minutes, until bubbly around the edges.
8. Brown and finish: Turn on the broiler for 1–2 minutes to lightly brown the top. Watch closely. Remove and sprinkle the rest of the Parmesan and parsley.
9. Rest and serve: Let sit 5–10 minutes so the sauce settles. Scoop and serve warm.

What Makes This Special

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This casserole brings classic Alfredo vibes without the heavy pasta. By swapping noodles with cauliflower, you cut carbs while keeping that creamy, cheesy goodness.

It’s a one-pan main dish that reheats beautifully and packs well for lunches. Best of all, you control the ingredients—no mystery thickeners, no sugar, just real food and bold flavor.

Ingredients

• 1 large head cauliflower, cut into bite-size florets (about 6–7 cups)
• 2 tablespoons olive oil or avocado oil
• 1 teaspoon kosher salt, plus more to taste
• 1/2 teaspoon black pepper
• 1 teaspoon garlic powder (for the cauliflower)
• 3 cups cooked chicken, shredded or diced (rotisserie works great)
• 1 cup shredded mozzarella
• 1/2 cup grated Parmesan, divided
• 2 tablespoons chopped fresh parsley (optional, for garnish)

For the Alfredo Sauce:

• 3 tablespoons butter
• 3 cloves garlic, minced
• 1 1/2 cups heavy cream
• 4 ounces cream cheese, softened and cubed
• 3/4 cup finely grated Parmesan
• 1/4 teaspoon nutmeg (optional, classic Alfredo note)
• 1/2 teaspoon salt, or to taste
• 1/4 teaspoon black or white pepper

Instructions

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1. Preheat and prep: Heat your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish.
2. Roast the cauliflower: Toss florets with olive oil, salt, pepper, and garlic powder.

   Spread on a sheet pan and roast 18–22 minutes, until just tender and lightly browned at the edges. Don’t overcook; it will bake again.

3. Make the Alfredo sauce: In a large saucepan over medium heat, melt butter. Add minced garlic and cook 30–60 seconds until fragrant.

   Pour in heavy cream and bring to a gentle simmer.

4. Enrich and thicken: Whisk in cream cheese until smooth. Stir in Parmesan, nutmeg, salt, and pepper. Simmer 2–3 minutes, stirring, until velvety and slightly thick.

   Taste and adjust seasoning.

5. Assemble the casserole: In the baking dish, combine roasted cauliflower and chicken. Pour the Alfredo sauce over the top and toss gently to coat.
6. Add the cheese: Sprinkle mozzarella and half of the remaining Parmesan evenly over the casserole.
7. Bake: Reduce oven temperature to 375°F (190°C). Bake 15–18 minutes, until bubbly around the edges.
8. Brown and finish: Turn on the broiler for 1–2 minutes to lightly brown the top.

   Watch closely. Remove and sprinkle the rest of the Parmesan and parsley.

9. Rest and serve: Let sit 5–10 minutes so the sauce settles. Scoop and serve warm.

Keeping It Fresh

• Storage: Cool completely, then cover and refrigerate for up to 4 days.
• Reheating: Warm individual portions in the microwave at 50–60% power to prevent the sauce from breaking.

  For the whole dish, cover with foil and reheat in a 325°F (165°C) oven until hot.

• Freezing: Assemble but don’t bake. Wrap tightly and freeze up to 2 months. Thaw overnight in the fridge, then bake as directed, adding 5–10 extra minutes if needed.
• Meal prep tip: Roast the cauliflower and make the sauce ahead.

  Assemble the day you plan to bake for the best texture.

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Health Benefits

• Low in carbs: Cauliflower keeps total carbs and net carbs down compared to pasta-based bakes.
• High in protein: Chicken provides a steady, satisfying protein boost that supports fullness and muscle upkeep.
• Healthy fats: Cream, cheese, and butter supply fats that help keep you full and support a keto approach.
• Micronutrients: Cauliflower brings vitamin C, K, and fiber, which support digestion and overall wellness.

Pitfalls to Watch Out For

• Watery casserole: Overcooked or un-drained cauliflower can release moisture. Roast it first, and avoid steaming.
• Broken sauce: Boiling the cream or microwaving at high power can cause separation. Keep it at a gentle simmer and reheat low and slow.
• Flat flavor: Alfredo needs salt and enough Parmesan.

  Taste the sauce before assembling and adjust.

• Rubbery chicken: Use cooked chicken that’s just done. Rotisserie or poached chicken stays tender.

Variations You Can Try

• Bacon and Spinach: Stir in 4–6 slices of crumbled cooked bacon and 2 cups fresh spinach (wilt it in the sauce).
• Mushroom Alfredo: Sauté 8 ounces sliced mushrooms in butter until browned, then fold into the mix.
• Buffalo Twist: Add 2–3 tablespoons buffalo sauce to the Alfredo and top with a little blue cheese.
• Pesto Swirl: Marble 2 tablespoons pesto into the sauce for a bright, herby note.
• Dairy-Light Option: Use half heavy cream and half unsweetened almond milk, and thicken gently with a small amount of cream cheese. Flavor with extra Parmesan for richness.
• Extra Veg: Broccoli florets or riced cauliflower can replace some of the cauliflower pieces for texture variety.