Low Carb Garlic Chicken & Mushroom Casserole
If you’re looking for a comforting low carb dinner that’s simple enough for a busy weeknight yet delicious enough to serve guests, this Low Carb Garlic Chicken & Mushroom Casserole deserves a place on your table.
Tender shredded chicken, earthy mushrooms, rich cream, plenty of garlic, and a bubbly layer of melted cheese come together to create an incredibly satisfying one-pan meal.
One of the best things about this recipe is how easily it comes together using leftover rotisserie chicken or cooked chicken breasts, making it a fantastic way to reduce food waste while getting dinner on the table quickly.
Whether you’re following a low carb lifestyle, eating keto-friendly meals, or simply looking for a hearty family dinner without pasta or rice, this creamy chicken casserole delivers comfort without the extra carbohydrates.
Why This Recipe Is One You’ll Love
- Naturally low in carbohydrates
- High in protein and healthy fats
- Uses simple pantry ingredients
- Great way to use leftover chicken
- Rich garlic flavor without being overpowering
- Family-friendly comfort food
- Ready in about 40 minutes
- Perfect for meal prep
What Makes This Casserole Low Carb?
Traditional chicken casseroles often rely on cream soups, flour, breadcrumbs, pasta, or rice. This version skips all of those higher-carb ingredients and instead uses:
- Heavy cream for richness
- Fresh mushrooms for hearty texture
- Chicken for lean protein
- Cheese for flavor and creaminess
- Garlic and herbs for incredible taste
The result is a filling meal that supports a lower carbohydrate lifestyle while still tasting indulgent.
Ingredient Highlights
Cooked Chicken
This recipe works beautifully with:
- Rotisserie chicken
- Leftover grilled chicken
- Baked chicken breasts
- Poached chicken
- Slow cooker chicken
Shredded chicken absorbs the creamy garlic sauce, making every bite flavorful.
Mushrooms
Fresh mushrooms add a savory, umami flavor and meaty texture.
Great choices include:
- White button mushrooms
- Baby bella (cremini)
- Portobello
- Shiitake
Garlic
Fresh minced garlic provides the signature flavor in this casserole. Fresh cloves offer much better flavor than jarred garlic, although either works in a pinch.
Heavy Cream
Heavy cream creates a silky sauce without adding flour or starch.
Cheese
Mozzarella creates a wonderfully stretchy topping, while cheddar adds a sharper flavor. Or mix it up with one of these choices:
- Monterey Jack
- Gruyère
- Swiss
- Provolone
- Pepper Jack for a little heat
Tips for the Best Garlic Chicken Casserole
Sauté the Mushrooms First
Cooking the mushrooms before baking removes excess moisture and concentrates their flavor.
Don’t Overcook the Chicken
Since the chicken is already cooked, the oven simply heats it through. Overbaking can dry it out.
Use Freshly Shredded Cheese
Freshly grated cheese melts much smoother than pre-shredded cheese, which often contains anti-caking agents.
Let It Rest
Allow the casserole to sit for about 5 minutes after baking. This helps the creamy sauce thicken slightly before serving.
Easy Variations
This recipe is incredibly versatile. We love to add fresh veggies that have been parboiled.
Add Vegetables
Mix in:
- Spinach
- Broccoli florets
- Cauliflower
- Zucchini
- Kale
Make It Spicy
Add:
- Red pepper flakes
- Cayenne pepper
- Diced jalapeños
Extra Herbs
Fresh herbs pair beautifully with garlic.
Try:
- Thyme
- Rosemary
- Chives
- Basil
Add Bacon
Crispy bacon adds smoky flavor and crunch.
What Do I Serve with Garlic Chicken Casserole?
This hearty casserole pairs well with many low carb side dishes.
Some favorites include:
- Roasted asparagus
- Garlic green beans
- Caesar salad (without croutons)
- Steamed broccoli
- Roasted Brussels sprouts
- Cauliflower mash
- Zucchini noodles
- Simple garden salad
Recipe Tips
- Use rotisserie chicken to save time.
- Pat mushrooms dry after washing to prevent excess moisture.
- Season generously with salt and pepper.
- Sprinkle fresh parsley on top just before serving for a burst of freshness and color.
Low Carb Garlic Chicken & Mushroom Casserole
Ingredients
- 2 cups cooked chicken shredded
- 1 cup mushrooms sliced
- 1 cup heavy cream
- 2 cloves garlic minced
- 1 cup shredded cheese e.g., mozzarella or cheddar
- 1 tablespoon olive oil
- Salt and pepper
- Fresh parsley for garnish optional
Instructions
- Preheat the oven to 350°F (175°C). In a skillet, heat the olive oil over medium heat. Add the mushrooms and garlic, cooking until the mushrooms are tender.
- In a large bowl, combine the cooked chicken, sautéed mushrooms and garlic, heavy cream, and half of the cheese. Season with salt and pepper to taste.
- Transfer the mixture to a greased casserole dish and top with the remaining cheese.
- Bake in the preheated oven for 25-30 minutes, until bubbly and golden. Garnish with fresh parsley if desired and serve hot.
Storage & Meal Prep
This casserole is excellent for meal prep because the flavors continue to develop after refrigeration.
Refrigerator:
Store covered for up to 4 days.
Freezer:
Freeze for up to 3 months in an airtight container.
To Reheat:
Warm in a 350°F oven until heated through or microwave individual portions for 2–3 minutes.
Final Thoughts
When comfort food cravings hit, this Low Carb Garlic Chicken & Mushroom Casserole is the perfect solution. It’s creamy, cheesy, packed with savory garlic flavor, and easy enough for weeknight dinners while still feeling special enough for entertaining.
Made with everyday ingredients and ready in under an hour, this casserole is a dependable recipe you’ll come back to again and again. Pair it with your favorite roasted vegetables or a crisp green salad for a complete low carb meal that’s both satisfying and delicious.
FAQs
Can I make this chicken casserole ahead of time?
Yes. Assemble the casserole up to one day in advance, cover, and refrigerate. When ready to bake, remove it from the refrigerator while the oven preheats, then bake as directed. You may need to add 5–10 extra minutes if it’s still cold.
Is this Garlic Chicken & Mushroom Casserole keto-friendly?
Yes. The recipe uses chicken, mushrooms, heavy cream, cheese, garlic, and olive oil—ingredients that are naturally low in carbohydrates. Depending on the exact products you use, it can fit well within a ketogenic or low carb eating plan.
Can I substitute the heavy cream?
Heavy cream provides the richest texture and lowest carbohydrate count. Full-fat cream cheese blended with a little chicken broth also works well. Half-and-half or milk will create a thinner sauce and increase the carbohydrate content.
What mushrooms work best in this recipe?
Cremini (baby bella) mushrooms are an excellent choice because they have a richer, more robust flavor than white button mushrooms. White mushrooms, portobellos, or even a blend of wild mushrooms also work beautifully.
Can I freeze this casserole?
Absolutely. Let the casserole cool completely, then wrap it tightly or store it in an airtight freezer-safe container. Freeze for up to three months and thaw overnight in the refrigerator before reheating.