Ben Kenwood June 4, 2026

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The Ultimate Low Carb Turkey Casserole

Name: Ultimate Low Carb Turkey Casserole
Prep time: 20 min
Cook time: 40 min
Total time: 1 h
Cuisine: American
Ingredients: 6 cups chopped cauliflower; 1 pound Crimini mushrooms, washed and sliced; 4 cups cooked leftover turkey or chicken; 1 onion, chopped; 2 tablespoons olive oil, divided; 1 teaspoon dried thyme; 1 teaspoon dried poultry seasoning; Salt and freshly ground black pepper to taste; 1 cup coarsely grated Mozzarella; 1 cup sour cream; 1/2 cup mayo; 2 tablespoons Dijon mustard; 1/2 teaspoon dried thyme; 1/2 teaspoon dried poultry seasoning; 1 cup grated Mozzarella; 1/4 cup coarsely grated Parmesan cheese

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The aroma of a hearty casserole bubbling in the oven can bring warmth and comfort to any gathering. Imagine gathering your loved ones around the table, sharing this delightful dish that not only satisfies but also nourishes. The Ultimate Low Carb Turkey Casserole is a perfect choice for weeknight dinners, meal prep, or even festive occasions when you want something healthy yet indulgent. You may also find Buffalo Chicken Stuffed Peppers Dairy Free Low Carb useful.

Why This Ultimate Low Carb Turkey Casserole Works

This casserole is a delightful blend of flavors and textures that will surely win you over. With its creamy goodness and nourishing ingredients, it satisfies both the palate and the soul. Plus, it’s completely low-carb, making it a fantastic choice for those following a keto lifestyle. You may also find Chicken Pot Pie In The Slow Cooker useful.

Here are just a few reasons to love this dish:

Packed with nutritious veggies
Easy to prepare and store
Versatile for leftovers or prep-ahead
Comfort food that doesn’t compromise on health
Family-friendly and satisfying

What You’ll Need

For this ultimate casserole, you’ll find that many of the ingredients work beautifully together to create a creamy and nourishing dish. Here’s what you’ll need to bring it to life:

6 cups chopped cauliflower (see notes)
1 pound Crimini mushrooms, washed and sliced
4 cups cooked leftover turkey or chicken
1 onion, chopped
2 tablespoons olive oil, divided (more or less depending on your pan)
1 teaspoon dried thyme
1 teaspoon dried poultry seasoning
Salt and freshly ground black pepper to taste
1 cup coarsely grated Mozzarella (or more)
1 cup sour cream
1/2 cup mayo
2 tablespoons Dijon mustard
1/2 teaspoon dried thyme
1/2 teaspoon dried poultry seasoning
1 cup grated Mozzarella
1/4 cup coarsely grated Parmesan cheese

Using fresh veggies like cauliflower and mushrooms not only heightens the flavor but also maintains the healthy profile of this dish.

How to Cook The Ultimate Low Carb Turkey Casserole

Spray a large glass or crockery casserole dish with olive oil or non-stick spray. (I used a dish that was 10″ x 13″, but any size that’s close will work.)
Preheat your oven to 375°F (190°C).
Chop up enough cauliflower to make 6 cups of small cauliflower pieces. For an even texture, you can use a food processor with a steel blade to pulse the cauliflower until it resembles slightly larger than rice kernels. Alternatively, frozen cauliflower rice works fine—about 3 cups.
Wash the mushrooms and cut them into thick half slices.
Dice the leftover turkey (or chicken) into bite-sized pieces.
In a mixing bowl, combine the sour cream, mayo, Dijon mustard, 1/2 teaspoon each of dried thyme and poultry seasoning, 1 cup grated Mozzarella, and 1/4 cup Parmesan to create a thick sauce mixture.
Heat 2 teaspoons of olive oil in a large non-stick frying pan. Sauté the mushrooms over medium-high heat until they release their liquid, allowing all the liquid to evaporate and the mushrooms start to brown.
Layer the sautéed mushrooms at the bottom of the casserole dish.
Add another 2 teaspoons of olive oil and sauté the chopped onions over medium-high heat until softened and starting to brown. Spread the onions over the mushrooms in the casserole dish.
Heat another 2 teaspoons of olive oil, then add the finely chopped cauliflower. Cook over medium-high heat, stirring often, until the cauliflower begins to soften and barely brown, about 3-4 minutes (cook slightly less time for frozen cauliflower rice).
Add 1 teaspoon each of dried thyme and poultry seasoning, cooking for about 1 minute more. Season the cauliflower rice with salt and freshly ground black pepper, and transfer it to the casserole dish over the onions and mushrooms.
Add the diced turkey into the dish, gently combining the ingredients with a spoon.
Spread the thick sauce mixture over the top and use the spoon to gently mix everything together until well combined.
Wipe off the edges of the casserole dish with a paper towel if necessary to keep the edges clean.
Sprinkle additional Mozzarella cheese on top and bake uncovered until the casserole is bubbling and the top is golden brown, about 40 minutes.
Let it cool for about 5 minutes before cutting into 8 servings.

Prep ~ 20 minutes, Cook ~ 40 minutes, Total ~ 1 hour, Servings ~ 8, Kcal ~ approx. 400 per serving.

Make-Ahead and Prep Tips

This casserole is perfect for meal prep, allowing you to create a delicious meal in advance. You can prepare the casserole up to a day ahead just before baking. Simply cover it tightly and refrigerate. When you’re ready to enjoy it, let it sit at room temperature while you preheat the oven, and then bake as directed.

How to Store Leftovers

To keep this dish fresh, store leftovers in airtight containers in the refrigerator for up to 4 days. If you want to keep it longer, consider freezing. It can be frozen for up to 3 months, but make sure to let it cool completely before wrapping in plastic wrap and placing it in airtight containers. For reheating, simply thaw overnight in the fridge and reheat gently in the oven until fully warm.

Perfect Pairings

Enhance your meal with these delightful pairings:

A fresh garden salad drizzled with vinaigrette
Sautéed green beans or broccoli for vibrant color
Garlic bread or low-carb rolls to soak up the sauce
A light and refreshing coleslaw on the side
Steamed asparagus seasoned with lemon for zest

Variations and Swaps

Make this casserole your own with these variations:

Swap in different vegetables like spinach or zucchini for a different flavor profile.
Use a blend of cheeses such as cheddar or gouda instead of all Mozzarella for varied taste.
For a bit of spice, add red pepper flakes or diced jalapeños into the sauce mixture.
Introduce some nuts, such as crushed almonds, for added crunch on top before baking.
If you prefer a creamy texture, you might add cream cheese to the sauce mix for extra richness.

Pro Tips for Best Results

To make your casserole even better, keep these tips in mind:

Make sure to sauté the veggies well to enhance their flavors before adding them to the dish.
Allow the casserole to cool slightly after baking for easier serving.
If using frozen cauliflower, ensure it is thoroughly drained before mixing it in.
Check for doneness by ensuring everything is heated through and the top is golden.

Frequently Asked Questions

Can I use fresh turkey instead of leftover turkey?
Yes, fresh cooked turkey can be used, just make sure to season it well as it may lack flavor.
Is there a substitute for sour cream?
Greek yogurt can be used as a lower-fat alternative for sour cream while still providing creaminess.
How can I make this dish dairy-free?
You can use dairy-free cheese alternatives and a plant-based sour cream.
Can I use other meats?
Yes, shredded chicken or even ground turkey can be used if you don’t have leftover turkey on hand.
What can I do with leftovers?
Leftovers can be reheated in the microwave or oven, and they make for an easy lunch option!

Wrapping Up

The Ultimate Low Carb Turkey Casserole is more than just a meal; it’s a warm embrace at the dinner table. With its rich flavors, hearty ingredients, and wonderful comfort, it’s the kind of dish that will leave you feeling satisfied and happy. Whether you’re serving a family gathering or just treating yourself, this casserole is bound to be a favorite. Why not give it a try soon? You’ll be glad you did!

Ultimate Low Carb Turkey Casserole

Author: anastasia-rice
Total Time: 60 minutes
Yield: 8 servings 1x
Diet: Low Carb

Print Recipe

Description

A creamy and nourishing low-carb turkey casserole, perfect for weeknight dinners or meal prep.

Instructions

Spray a large glass or crockery casserole dish with olive oil or non-stick spray.
Preheat your oven to 375°F (190°C).
Chop the cauliflower into small pieces.
Wash and slice the mushrooms.
Dice the leftover turkey or chicken.
Combine sour cream, mayo, Dijon mustard, seasonings, and cheeses in a mixing bowl.
Heat olive oil in a non-stick pan and sauté the mushrooms until they release and evaporate liquid.
Layer the sautéed mushrooms in the casserole dish.
Heat more olive oil and sauté the onions until softened, then layer over the mushrooms.
Cook the cauliflower in hot olive oil until starting to soften, then season with spices and layer over the onions.
Add the diced turkey into the dish, combining gently.
Spread the sauce mixture on top and mix gently.
Wipe the edges of the dish clean.
Sprinkle additional Mozzarella cheese on top and bake for 40 minutes.
Let cool for 5 minutes before serving.