The Creamiest Keto Chicken Alfredo Casserole Your Family Will Actually Beg For

You know that moment when everyone at the table goes quiet because the food is that good? That’s exactly what happens the first time you serve this keto chicken alfredo casserole. 

If you’ve been missing that rich, creamy pasta comfort since going low-carb — this is your answer. It comes together on a busy weeknight in under an hour, uses simple ingredients you likely already have, and the best part? 

Your kids and non-keto spouse will devour it without a single complaint. No separate meals, no compromises. Just one gloriously cheesy, saucy dish that brings everyone to the table happy. Let’s set you up with the right tools first.

🛒 Recommended Products from Amazon

⭐ Lodge 12-Inch Cast Iron Skillet — Sears chicken to golden perfection and goes straight from stovetop to oven, saving you an extra pan.

⭐ Pyrex 9×13 Glass Baking Dish — The ideal size for this casserole and makes serving, storing, and reheating a breeze.

⭐ Instant Pot Duo 7-in-1 — Cooks chicken breasts from frozen in under 30 minutes, making weeknight prep genuinely effortless.

⭐ KitchenAid Stand Mixer — Shreds cooked chicken in under 60 seconds with the paddle attachment — a total game-changer for casseroles.

⭐ Rubbermaid Brilliance Meal Prep Containers — Airtight, leak-proof, and perfectly sized for storing individual portions for next-day lunches.

Disclaimer: As an Amazon Associate, I may earn a small commission from qualifying purchases at no extra cost to you.

Why You’ll Love This Recipe

• Only 4–5g net carbs per serving — all the indulgence, none of the guilt
• Family-friendly — kids won’t even notice there’s no pasta
• Ready in about 45 minutes — realistic for a weeknight dinner
• Ultra creamy and cheesy — the homemade alfredo sauce is rich and deeply satisfying
• Meal prep gold — tastes even better the next day and reheats beautifully

Ingredients

For the Alfredo Sauce

• 4 oz cream cheese, softened
• 1 cup heavy whipping cream
• ½ cup grated parmesan cheese
• 2 tbsp unsalted butter
• 2 cloves garlic, minced
• ½ tsp salt
• ¼ tsp black pepper
• Pinch of nutmeg

For the Casserole

• 2.5 cups cooked chicken breast, cubed or shredded (rotisserie chicken works perfectly here!)
• 3 cups cauliflower rice, fresh or frozen (sub broccoli florets if your family prefers)
• 1.5 cups shredded mozzarella cheese, divided
• ¼ cup grated parmesan, for topping
• 1 tbsp olive oil
• 1 tsp garlic powder
• 1 tsp Italian seasoning
• Salt and pepper to taste

Shortcut tip: Grab a rotisserie chicken from Costco or Sam’s Club and you’ll have this casserole in the oven in 20 minutes flat.

Step-by-Step Instructions For Keto Chicken Alfredo Casserole

1. Preheat your oven to 350°F and grease a 9×13 baking dish with butter or olive oil.
2. Dry out the cauliflower rice first. Spread it on a baking sheet and bake for 10–12 minutes to release excess moisture. Don’t skip this — it’s the secret to a non-watery casserole.
3. Make the alfredo sauce. Melt butter in your cast iron skillet over medium-low heat, add garlic and sauté for 1 minute until fragrant. Add cream cheese and stir until melted, then slowly whisk in the heavy cream. Stir in parmesan, salt, pepper, and nutmeg. Simmer for 3–5 minutes until smooth and slightly thickened.
4. Season and combine. In a large mixing bowl, toss the cooked chicken and dried cauliflower rice with garlic powder, Italian seasoning, salt, and pepper. Pour in ¾ of the alfredo sauce and 1 cup of the mozzarella. Stir gently to combine.
5. Assemble the casserole. Pour the mixture into your greased baking dish and spread evenly. Drizzle the remaining alfredo sauce over the top.
6. Top with cheese. Sprinkle the remaining ½ cup mozzarella and the parmesan over the top in an even layer.
7. Bake for 25–30 minutes, until the cheese is melted, bubbling, and golden at the edges. Let it rest for 5 minutes before serving — this helps it set and makes scooping much cleaner.

Pro Tips & Variations

• Make it ahead: Assemble the full casserole without baking, cover tightly, and refrigerate for up to 2 days. Bake straight from the fridge — just add 5–10 extra minutes.
• Freeze it: This casserole freezes well for up to 3 months. Freeze before baking for best texture, then thaw overnight in the fridge before cooking.
• Swap the veggie: Broccoli florets, sautéed spinach, or sliced mushrooms all work beautifully in place of cauliflower rice.
• Dairy-free version: Replace cream cheese with soaked cashew cream and use a dairy-free mozzarella — the texture stays surprisingly creamy.

Storing & Reheating

Fridge: Store leftovers in an airtight container for up to 4 days.

Freezer: Freeze in individual portions in airtight containers for up to 3 months. Thaw overnight in the refrigerator before reheating.

Reheating: For the best results, reheat in the oven at 325°F for 10–15 minutes. For a quick lunch, microwave individual portions on high for 2–3 minutes, stirring halfway through. Add a small splash of heavy cream before reheating to keep the sauce silky.

Nutrition Info (Per Serving, Approx. 6 Servings)

Macro	Amount
Calories	~460
Fat	36g
Protein	28g
Net Carbs	4–5g

These are estimates and may vary based on specific brands and ingredients used.

📋 Recipe Card: Keto Chicken Alfredo Casserole

You’re Going to Love This One

Go ahead and make this tonight — your family won’t believe it’s keto. If you loved this recipe, save it to your Pinterest boards so you can find it again easily, and share it with a friend who’s been struggling to find comfort food on a low-carb diet. Tried it? Drop a comment below and tell me how it went — I’d love to hear your family’s reaction!