Creamy Chicken and Mushroom Cauliflower Rice Casserole

Creamy Chicken and Mushroom Cauliflower Rice Casserole is so comforting and delicious, it's hard to believe that it's actually low-carb and packed with healthy veggies. Made with shredded chicken meat, mushrooms and leeks, this easy dinner is incredibly flavorful and creamy, though it uses no cream or milk! 

I always get excited about casseroles! Something about the pure comfort they provide is unparalleled. Creamy casseroles are the best kind, in my opinion, and this one is exceptionally creamy, thanks to the velvety sauce that combines cashews, coconut milk, nutritional yeast, garlic and chicken broth.

The bold flavors of mushrooms and leek and the creaminess of the sauce help to hide the cauliflower taste and if you don’t know it’s made with cauliflower rice, you may think it’s regular, soft cooked rice.

Don’t get me wrong, I DO love the taste of cauliflower. In some dishes though, and this one is a prime example, I like the cauliflower to be a culinary chameleon that will take on other flavors. In this creamy casserole the cauliflower is supposed to quietly replace regular rice, after all.

For another lightened up comfort food recipe make sure you also check my Creamy Zucchini Mushroom Pasta. 

WHAT YOU WILL NEED

Cauliflower rice: For this particular recipe, I recommend using frozen cauliflower rice because it is easy to squeeze in a kitchen towel and remove most of its water content.

Chicken: Use cooked boneless skinless chicken breasts or thighs. Cook your own or use store bought rotisserie chicken. I like to reserve chicken breasts from a roasted whole chicken and use them for this recipe.

Mushrooms: Brown (baby bella) or button mushrooms will both work. I like brown better because they have a deeper flavor.

Cashews: Make sure to use raw and unsalted cashews.

Coconut milk: Use canned full fat coconut milk. Make sure to give it a shake before opening the can because the fat tends to solidify and separate from the liquid.

Leek: Milder than onion, leek goes really well with chicken and I love the leek + chicken + mushroom combo. Don’t use the green part of leek. I cut it off, place in a zip lock bag, freeze it and use it in my homemade chicken stock or bone broth.

Nutritional yeast: Used to add a cheesy flavor to the sauce. Nutritional yeast is a grated parmesan cheese alternative that’s plant-based and it works very well in this dish.

Parmesan cheese: This is completely optional but I like to sprinkle some parmesan on top of the casserole before baking for a wonderfully crispy, roasted topping. For a dairy-free option just use more nutritional yeast.

HOW TO MAKE CREAMY CHICKEN AND MUSHROOM CAULI RICE CASSEROLE

Step 1: Soak the cashews for a couple hours before making the dish. While this is an important step to make a velvety smooth cashew cream,  don’t stress about it if you forgot to soak the nuts for several hours. If you have a good blender, a quick soak in boiling water will do the trick.

Step 2: Squeeze the moisture out of cauliflower rice. This is a crucial step that will prevent the casserole from getting watery and mushy. Just thaw the cauli rice until room temperature, place in a clean kitchen towel, make a little “packet” and squeeze using both hands oven the kitchen sink. Try to get as much liquid out as possible.

Step 3: Cook mushrooms and leeks. Sauté mushrooms and leeks in ghee or oil until they start browning, 5-6 minutes. Add squeezed out cauliflower rice and chicken, and turn off the heat.

Step 4: Make the sauce. Place soaked and drained cashews, coconut milk, fresh garlic and nutritional yeast in a high-speed blender and whizz it until smooth and creamy.

Step 5: Assemble. Pour the sauce into the cauliflower rice mixture, season with salt and pepper, stir and transfer to a greased casserole dish. Sprinkle with parmesan or more nutritional yeast on top.  

Step 6: Bake and broil. Bake in 425 degrees Fahrenheit for about 20 minutes until nice and bubbly. Finish by broiling for a couple more minutes until the top is lightly brown. Watch the casserole while broiling so you don’t burn it. Take out of the oven and serve!

TIPS FOR MAKING AHEAD, STORING & FREEZING

• As with most casseroles, this Creamy Chicken, Mushroom and Cauliflower Rice Casserole can be fully assembled ahead of time and stored in the fridge for a couple days. Just pop it in the oven when you’re ready to eat and you’ll have dinner on the table in less than 30 minutes. Because the dish will be very cold from the fridge, it may take a couple minutes more than 20 minutes to become hot and bubbly. Just check at the 20 minutes mark and add more time, if needed.
• The casserole can be stored in airtight containers for up to 5 days and frozen for up to 6 months.
• To reheat, just pop it in the microwave for a minute or 2 until heated through.

SUBSTITUTIONS & SPECIAL DIETS

• For Paleo/Whole30 version, don’t use parmesan cheese on top. Instead, just sprinkle some more nutritional yeast for an extra “cheesy” boost.
• If you follow the Keto diet and do eat dairy, feel free to replace nutritional yeast with parmesan cheese all together.
• For a vegan version, skip the chicken and cheese and use vegetable broth instead of chicken broth. This is a very versatile dish and though it has “chicken” in the title, the mushrooms and leeks have enough flavor to make it completely plant-based and delicious.
• If you are looking for a healthier rice and chicken casserole but don’t like or have cauliflower rice, just use cooked brown rice place of cauliflower. No need to squeeze the moisture out from the rice!

If you make this Creamy Chicken, Mushroom and Cauliflower Rice Casserole, please be sure to leave me a comment and give this recipe a rating. I would love to hear from you and see how it turned out for you! You can also share and tag me on Instagram!

No time to make it now? Just pin it now and save the recipe for later!

OTHER KETO DINNER IDEAS

• Egg Roll in a Bowl with Cauliflower Rice
• Chicken Caprese Sheet Pan
• Spaghetti Squash with Bacon, Spinach and Goat Cheese Skillet
• Tuna Melt Zucchini Boats
• Italian Stuffed Zucchini Boats with Ground Chicken

Creamy Chicken and Mushroom Cauliflower Rice Casserole

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★★★★★

5 from 12 reviews

• Author: Agnieszka
• Total Time: 53 minutes
• Yield: 4-6 servings 1x

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Description

Creamy Chicken and Mushroom Cauliflower Rice Casserole is so comforting and delicious, it's hard to believe that it's actually low-carb and packed with healthy veggies.

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Ingredients

Scale 1x2x3x

1 large leek
10 oz baby bella or white mushrooms, sliced
1 tbsp ghee (or mild tasting oil such as avocado or canola)
½ cup raw cashews
2 cooked chicken breasts, shredded
1 cup coconut milk, full fat
⅔ cup chicken broth
24 oz frozen cauliflower rice, thawed (I used two 12 oz bags)
1 garlic clove, peeled
2 tbsp nutritional yeast
2 tbsp grated parmesan cheese (optional)
Salt and pepper to taste

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Instructions

1. Soak the cashews in boiling water for a couple hours or at least 30 minutes.
2. Heat the oven to 425 degrees F.
3. Place the thawed cauliflower rice in a clean kitchen towel and squeeze the moisture out over the sink. Keep squeezing until no more liquid comes out.
4. Cut the green part off the leek and discard or freeze for future use. Cut the leek lengthwise, clean it out under running water and slice into half circles.
5. In a deep skillet heat the ghee or oil and sauté mushrooms and leeks for about 5 minutes on medium heat until lightly caramelized. Add squeezed out cauliflower rice and shredded chicken. Stir together and turn off the heat.
6. Make the creamy sauce. Drain the cashews and place them in a high-speed blender with chicken broth, coconut milk, nutritional yeast and garlic. Blend until completely smooth.
7. Pour the creamy cashew sauce over the cauliflower rice, chicken, mushrooms and leeks, season with some salt and pepper and give it a stir.
8. Spray a 9x13’’ or similar casserole dish with oil or lightly grease with oil and transfer the cauliflower rice mixture into the dish. Sprinkle with parmesan cheese or more nutritional yeast on top.
9. Bake in the preheated oven for 20 minutes. Turn the broiler on and broil for 1-3 minutes watching the casserole the whole time so the top crisps and browns lightly. Be careful not to burn it.
10. Take out of the oven and serve immediately.

Notes

Squeezing the moisture out of cauliflower rice is a crucial step that will prevent the casserole from getting watery and mushy. Just thaw the cauli rice until room temperature, place in a clean kitchen towel, make a little “packet” and squeeze using both hands oven the kitchen sink. Try to get as much liquid out as possible.

This casserole is very forgiving when it comes to the ingredients ratio. If you like lots of protein, use big chicken breasts. If you want to skip the meat all together and make it vegan, just use mushrooms and leeks, swap vegetable broth for chicken broth and skip the cheese. You can also add more or different vegetables such as spinach, kale or broccoli. It will be delicious either way you make it!

• Prep Time: 30 minutes
• Cook Time: 23 minutes
• Category: dinner
• Cuisine: American

Keywords: cauliflower rice, chicken and rice casserole, healthy chicken and rice casserole, chicken breast recipes, keto casserole