This quick high-protein dinner is ready in just 40 minutes, combining tender shredded chicken with creamy cheese and low-carb cauliflower rice. Perfect for busy weeknights or meal prep.

Ingredients

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Instructions

Step 1

Preheat your oven to 375°F (190°C) and lightly grease a 9×13-inch (or similar 3-quart) baking dish with nonstick spray or a thin layer of olive oil. This ensures the casserole won’t stick and makes cleanup a breeze. While the oven heats, prepare your cauliflower rice: if using frozen, place it in a microwave-safe bowl and microwave for 3-4 minutes, then drain any excess liquid by pressing it through a fine-mesh sieve or squeezing it in a clean kitchen towel. Removing as much moisture as possible is critical—excess water will make your casserole soggy. For fresh cauliflower rice, you can sauté it in a dry skillet over medium heat for 3-4 minutes to evaporate moisture. Set aside.

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Step 2

In a large skillet over medium heat, warm 1 tablespoon of olive oil until shimmering. Add the diced onion and cook, stirring occasionally, for 4-5 minutes until translucent and fragrant—the onions should soften but not brown. Add the minced garlic and cook for another 30 seconds until aromatic, being careful not to burn the garlic (it turns bitter quickly). This aromatic base builds the foundational flavor of the casserole, so take your time here.

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Step 3

Reduce the heat to medium-low and add the cream cheese to the skillet, breaking it into pieces with a wooden spoon. Stir continuously until the cream cheese is fully melted and incorporated with the onions and garlic, about 2 minutes. The mixture will look creamy and cohesive. Slowly pour in the chicken broth while whisking to combine, then add the heavy cream. Continue whisking until the sauce is smooth and slightly thickened, about 3 minutes. You should see small bubbles forming around the edges—this indicates the sauce is heating through without boiling (which could cause curdling).

Step 4

Stir in 1 cup of the shredded cheddar cheese, the Parmesan cheese, dried thyme, smoked paprika, salt, and pepper. Whisk until all the cheese is melted and the sauce is velvety and smooth. Taste and adjust seasoning if needed—the sauce should be well-seasoned because it will coat the cauliflower and chicken. Remove from heat.

Step 5

Add the drained cauliflower rice and the shredded chicken to the skillet with the cheese sauce. Fold everything together with a spatula until the cauliflower and chicken are evenly coated. The mixture will look thick and hearty. Transfer the entire mixture to the prepared baking dish, spreading it into an even layer with the spatula. Sprinkle the remaining 1/2 cup of cheddar cheese evenly over the top—this will create a golden, bubbly crust.

Step 6

Place the baking dish on the middle rack of the preheated oven and bake for 20 minutes, or until the casserole is hot and bubbly around the edges and the top cheese is melted and lightly golden. For a deeper golden crust, switch the oven to broil for the last 1-2 minutes, watching closely to prevent burning. The internal temperature should reach at least 165°F (74°C) if you want to be precise. Remove from the oven and let it rest for 5 minutes—this allows the casserole to set slightly for cleaner slices. Garnish with fresh parsley and serve warm.

For best results

  • Moisture management is the secret to a perfect cauliflower casserole. Cauliflower naturally contains a lot of water, and if you don't remove it, your casserole will turn watery and loose. After thawing frozen cauliflower rice, press it firmly in a fine-mesh sieve or wrap it in a clean dish towel and wring out as much liquid as possible. For fresh cauliflower rice, sauté it in a dry pan over medium-high heat for 3-4 minutes, stirring frequently, until it releases steam and starts to dry out. This extra step ensures your casserole has a satisfying, rice-like texture rather than a mushy one.
  • Shredding your own cheese from a block is worth the extra minute. Pre-shredded cheeses are coated with anti-caking agents like cellulose or potato starch, which prevent clumping but also inhibit smooth melting. For a creamy, luscious sauce that doesn't turn grainy, buy a block of cheddar and shred it yourself using a box grater or food processor. The same goes for Parmesan—freshly grated melts more evenly and delivers superior flavor.
  • Cook your chicken in bulk to save time. You can poach, bake, or use a rotisserie chicken from the store. For poaching, place chicken breasts in a pot, cover with water or broth, bring to a simmer, and cook for 12-15 minutes until the internal temperature reaches 165°F. Then shred with two forks. If using a rotisserie chicken, remove the skin and shred the meat—this yields about 3 cups of shredded chicken, perfect for the recipe. You can even cook extra chicken on the weekend and keep it refrigerated for quick meals throughout the week.
  • To make this casserole dairy-free, substitute the heavy cream with full-fat canned coconut milk (shake well before measuring), use a dairy-free cream cheese alternative (such as Kite Hill or Violife), and replace the cheddar and Parmesan with your favorite dairy-free shreds. Nutritional yeast can also add a cheesy flavor. Note that the texture may be slightly less creamy, but the casserole will still be delicious and satisfying.
  • For meal prep, assemble the casserole completely but do not bake it. Cover tightly with foil or a lid and refrigerate for up to 3 days. When ready to eat, bake directly from the refrigerator, adding 5-10 minutes to the baking time (check that the center is hot). You can also freeze the unbaked casserole for up to 3 months—thaw overnight in the refrigerator before baking. Baked casserole can be stored in airtight containers in the fridge for up to 5 days and reheated in the microwave or oven.

Variations

  • Vegetarian Version: Omit the chicken and double the cauliflower rice (use about 8 cups total). Add 1 can (15 oz) of drained and rinsed chickpeas or 1 cup of cooked lentils for protein. You can also stir in 2 cups of chopped spinach or kale along with the cauliflower for extra nutrients. The cheese sauce provides plenty of richness, so this version is just as satisfying.
  • Spicy Southwest Twist: Add 1 diced jalapeño (seeds removed for less heat) along with the onion, and stir in 1 teaspoon of cumin and 1/2 teaspoon of chili powder with the spices. Replace the cheddar with a Mexican blend cheese or pepper jack. Top with sliced avocado, a dollop of sour cream, and fresh cilantro before serving. This variation packs a flavorful punch.
  • Broccoli & Chicken Casserole: Replace half of the cauliflower rice with finely chopped broccoli florets (about 2 cups). Steam or microwave the broccoli for 2 minutes to soften before adding to the mixture. Broccoli pairs beautifully with the creamy cheese sauce and adds extra fiber and vitamins. You can also use frozen broccoli florets, thawed and chopped.
  • Keto-Friendly Upgrade: To make this casserole even lower in carbs, use full-fat cream cheese and heavy cream (already in the recipe). You can also add 1/2 cup of cooked, crumbled bacon for extra fat and flavor. For a thicker sauce, stir in 2 tablespoons of cream cheese additional or 1/4 cup of shredded mozzarella. Serve with a side of roasted vegetables or a crisp green salad.

Nutrition

  • Calories385 kcal
  • Total Fat24g
  • Saturated Fat13g
  • Cholesterol115mg
  • Sodium620mg
  • Total Carbohydrates9g
  • Dietary Fiber3g
  • Sugars4g
  • Protein32g

Common Questions

Can I use fresh cauliflower instead of riced cauliflower?
Absolutely! To make your own cauliflower rice, simply cut a head of cauliflower into florets, then pulse them in a food processor in batches until they resemble rice grains. Avoid overprocessing, or you’ll end up with a puree. One medium head of cauliflower yields about 4 cups of rice. You’ll need to cook the fresh rice before adding it to the casserole—sauté it in a dry skillet over medium heat for 3-4 minutes to remove moisture, then proceed with the recipe.
How do I store leftovers and how long do they last?
Leftovers can be stored in an airtight container in the refrigerator for up to 5 days. Reheat individual portions in the microwave for 1-2 minutes, or reheat the entire casserole in a 350°F oven for 10-15 minutes until warmed through. You can also freeze the baked casserole for up to 3 months. To freeze, let it cool completely, then wrap tightly with plastic wrap and foil. Thaw overnight in the fridge before reheating. The texture may be slightly softer after freezing due to the cauliflower’s water content, but it will still be delicious.
Can I use a different type of cheese?
Yes, this recipe is very flexible with cheese. Cheddar provides a sharp, melty base, but you can substitute with Monterey Jack, mozzarella, Gouda, or a combination. For a stronger flavor, try Gruyère or smoked cheddar. If you prefer a milder taste, use mild cheddar or Colby. Just ensure the cheese melts well—avoid hard, aged cheeses like Parmesan (use it only as a small addition for flavor). The total amount of cheese should remain about 2 cups (shredded) for the best texture.
Is this casserole gluten-free?
Yes, this recipe is naturally gluten-free as written. All ingredients—chicken, cauliflower, cheese, cream, and spices—are gluten-free. However, always check labels on packaged items like chicken broth (some brands may contain gluten) and cream cheese to ensure they are certified gluten-free if you have celiac disease or a severe sensitivity. Most standard brands are safe.
Can I make this casserole ahead of time?
Definitely! Assemble the casserole completely (without baking) and cover it tightly. Refrigerate for up to 3 days. When ready to bake, remove the dish from the fridge while the oven preheats (about 15 minutes) to take the chill off, then bake as directed, adding 5-10 minutes if needed. You can also freeze the unbaked casserole for up to 3 months—thaw in the refrigerator overnight before baking.
What can I serve with this casserole?
Since this casserole is a complete meal with protein, vegetables, and healthy fats, it pairs well with a simple side salad dressed with lemon vinaigrette or steamed green beans. For extra crunch, serve with roasted asparagus or a side of sautéed mushrooms. If you’re not strictly low-carb, a slice of crusty bread or a side of quinoa would also be lovely.