This low-carb chicken cauliflower casserole combines tender shredded chicken with creamy cheese and cauliflower rice for a macro-friendly meal prep option. Ready in 40 minutes!

Ingredients

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Instructions

Step 1

Preheat your oven to 375°F (190°C). While the oven heats, prepare your cauliflower rice. If using a whole head of cauliflower, cut it into florets and pulse in a food processor until it resembles rice grains. Do not overprocess or it becomes mushy. You should have about 4 cups. If using pre-riced cauliflower, spread it on a baking sheet and pat dry with paper towels to remove excess moisture—this prevents a watery casserole. Set aside.

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Step 2

Season the chicken breasts evenly with salt, pepper, paprika, and onion powder. In a large skillet over medium-high heat, add 1 tablespoon olive oil. Once shimmering, add the chicken breasts and cook for 5-7 minutes per side until golden brown and cooked through (internal temperature 165°F/74°C). Transfer to a cutting board and let rest for 5 minutes. Shred the chicken using two forks or a hand mixer on low speed for quick shredding.

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Step 3

In the same skillet, reduce heat to medium and add remaining 1 tablespoon olive oil. Add minced garlic and sauté for 30 seconds until fragrant. Add the cauliflower rice and cook, stirring occasionally, for 5-7 minutes until tender and slightly golden. Season with a pinch of salt and pepper. If the mixture seems dry, add chicken broth to keep it moist. Remove from heat.

Step 4

In a large mixing bowl, combine the shredded chicken, cooked cauliflower rice, heavy cream, and 1 cup of shredded cheddar cheese. Stir until everything is well coated. The cream and cheese create a luscious, creamy sauce that binds the casserole. Taste and adjust seasoning if needed.

Step 5

Transfer the mixture to a greased 9×13-inch baking dish (or similar 3-quart dish). Spread evenly with a spatula. Sprinkle the remaining ½ cup cheddar cheese on top, covering the surface for a golden, bubbly crust. For extra color, you can add a dash of paprika on top.

Step 6

Bake in the preheated oven for 20-25 minutes, until the cheese is melted and bubbly and the edges are lightly browned. For a deeper golden top, switch to broil for the last 2 minutes, watching carefully to avoid burning. Let the casserole rest for 5 minutes before serving—this allows the sauce to thicken slightly. Serve warm, garnished with fresh parsley if desired.

For best results

  • To ensure your cauliflower rice isn't watery, squeeze out excess moisture after cooking. Place the cooked riced cauliflower in a clean kitchen towel and wring it out over the sink. This step is crucial for a creamy, not soupy, casserole. Alternatively, you can spread the riced cauliflower on a baking sheet and bake at 375°F for 10 minutes to dry it out before mixing with other ingredients.
  • For the best flavor, use freshly shredded cheddar cheese instead of pre-shredded. Pre-shredded cheese contains anti-caking agents that prevent it from melting smoothly, resulting in a grainy texture. Shredding your own cheese also gives you control over the thickness—shred on the large holes of a box grater for perfect meltability.
  • If you're meal prepping for the week, consider undercooking the casserole slightly by reducing the bake time by 5 minutes. When you reheat individual portions, they'll finish cooking without becoming dry. Store in airtight containers in the refrigerator for up to 5 days. Reheat in the microwave or oven at 350°F until warmed through.
  • To add a crispy topping, mix ¼ cup grated Parmesan cheese with ¼ cup almond flour and a tablespoon of melted butter. Sprinkle this mixture over the casserole before baking for a keto-friendly crumb topping that adds texture and savory flavor. Alternatively, crushed pork rinds work wonderfully for a crunchy, zero-carb option.
  • For a dairy-free version, substitute the heavy cream with full-fat coconut cream and use a dairy-free shredded cheese like mozzarella-style shreds made from cashews or tapioca starch. Nutritional yeast can also be added for a cheesy flavor. Note that the texture may be slightly less creamy, but still delicious.
  • To save time, use rotisserie chicken. Shred the meat from a whole rotisserie chicken (about 3 cups) and skip the cooking step. This reduces prep time to just 10 minutes. Adjust seasoning accordingly, as rotisserie chicken is already seasoned.
  • If you prefer a spicier kick, add ½ teaspoon red pepper flakes or a diced jalapeño to the garlic when sautéing. You can also use pepper jack cheese instead of cheddar for extra heat. For a smoky flavor, substitute half the paprika with chipotle powder.

Variations

  • Make it a chicken broccoli cauliflower casserole by adding 2 cups of steamed broccoli florets. Simply blanch the broccoli for 2 minutes in boiling water, then drain and fold into the mixture before baking. Broccoli adds color, fiber, and vitamins. You can also use frozen broccoli—just thaw and squeeze out excess water first.
  • For a Mexican-inspired twist, replace the cheddar with a Mexican blend cheese, add 1 can (4 oz) diced green chiles, and stir in ¼ cup chopped cilantro. Top with sliced jalapeños before baking. Serve with a dollop of sour cream and sliced avocado for a complete meal.
  • Transform this casserole into a chicken and mushroom version by sautéing 8 oz sliced cremini mushrooms with the garlic until golden brown. Mushrooms add an earthy umami flavor that pairs beautifully with the creamy sauce. You can also add 1 teaspoon dried thyme for an herby note.
  • To increase the protein content, mix in 1 cup of cottage cheese or Greek yogurt along with the heavy cream. This adds extra protein and a tangy flavor without significantly altering the texture. Cottage cheese also contributes calcium and probiotics.
  • For a paleo-friendly adaptation, replace the cheddar cheese with a dairy-free alternative and use coconut cream instead of heavy cream. Omit the cheese topping and instead bake with a sprinkle of nutritional yeast and almond flour for a golden crust. This version is also Whole30-compliant if you use compliant ingredients.
  • If you're not strictly low-carb, you can substitute cauliflower rice with cooked quinoa or brown rice for a heartier casserole. Note that this will increase the carbohydrate content. For a gluten-free option, use certified gluten-free ingredients—all the ingredients in the original recipe are naturally gluten-free.

Nutrition

  • Calories320 kcal
  • Total Fat18g
  • Saturated Fat10g
  • Cholesterol110mg
  • Sodium520mg
  • Total Carbohydrates8g
  • Dietary Fiber3g
  • Sugars3g
  • Protein35g

Common Questions

Can I freeze this chicken cauliflower casserole?
Yes, this casserole freezes beautifully. Assemble the casserole completely but do not bake. Cover tightly with plastic wrap and then aluminum foil. Freeze for up to 3 months. When ready to bake, thaw overnight in the refrigerator, then bake as directed, adding 10-15 minutes to the cooking time since it starts cold. You can also freeze individual portions after baking for quick lunches.
How do I prevent the casserole from being watery?
Watery casserole is usually due to excess moisture in the cauliflower. To avoid this, make sure to cook the cauliflower rice until most of the water has evaporated, and squeeze it in a towel if needed. Also, avoid overcooking the chicken, as it can release moisture. Letting the casserole rest for 5-10 minutes after baking allows the sauce to thicken.
Can I use frozen cauliflower rice?
Absolutely! Frozen cauliflower rice is a convenient time-saver. However, it contains more moisture than fresh. Thaw it completely and squeeze out as much water as possible using a clean kitchen towel or cheesecloth. Then cook it in the skillet as directed. You may need to cook it a few extra minutes to evaporate remaining moisture.
Is this recipe keto-friendly?
Yes, this casserole is keto-friendly. Cauliflower rice is low in carbs, and heavy cream and cheese are high in healthy fats. One serving contains approximately 8g net carbs (total carbs minus fiber). For stricter keto, ensure you use full-fat dairy and avoid any optional higher-carb add-ins like corn or beans.
What can I use instead of heavy cream?
For a lighter option, use half-and-half or whole milk, though the sauce will be less creamy. For dairy-free, use full-fat coconut cream or unsweetened almond milk mixed with a tablespoon of coconut oil. For a lower-fat version, use evaporated skim milk. Note that these substitutions will alter the richness and may require adjusting the seasoning.
How should I store leftovers?
Store leftovers in an airtight container in the refrigerator for up to 5 days. Reheat in the microwave in 30-second intervals, stirring halfway, or in a 350°F oven for 10-15 minutes until warmed through. The casserole may thicken upon refrigeration; add a splash of chicken broth or water when reheating if needed.
Can I add other vegetables?
Yes, this casserole is very versatile. You can add steamed broccoli, sautéed bell peppers, spinach (wilted and squeezed dry), or zucchini (salted and drained). Keep the total vegetable volume to about 2 cups to maintain the proper ratio. Adding too many vegetables may make the casserole watery, so adjust cooking time accordingly.