Keto Garlic Mushroom Chicken Casserole

If Keto Garlic Mushroom Chicken Casserole sounds like something you’d order at a fancy little bistro… but you’re currently standing in your kitchen wearing yesterday’s leggings (no judgment—same), you’re in exactly the right place.

This is the kind of dinner that feels comforting and a little indulgent, yet still fits that low-carb life. It’s creamy, garlicky, loaded with mushrooms, and topped with a bubbly cheese blanket that basically whispers, “You’re doing amazing, sweetie.” And the best part? You’re using cooked chicken, so we’re not starting from scratch like it’s a cooking show challenge.

Why You’ll Love This Keto Garlic Mushroom Chicken Casserole

• It’s fast but feels fancy. Creamy garlic sauce + mushrooms = restaurant vibes.
• Perfect for busy nights. Uses cooked chicken, so the oven does most of the work.
• Picky-eater friendly. Cheese tends to win people over. Even the skeptical ones.
• Meal-prep hero. It reheats like a dream (and tastes even better the next day).

Ingredients You’ll Need

Here’s what makes this casserole so cozy and satisfying:

• 2 cups cooked chicken, shredded or diced
• 8 ounces mushrooms, sliced (button or cremini)
• 4 cloves garlic, minced
• 1 cup heavy cream
• 1 cup shredded mozzarella cheese
• 1/2 cup grated Parmesan cheese
• 1 tablespoon olive oil
• 1 teaspoon dried thyme
• 1 teaspoon dried oregano
• Salt and pepper, to taste
• Fresh parsley, chopped (for garnish)

Aneta’s quick note: I love using rotisserie chicken here. It’s basically the “I’m trying but also tired” shortcut, and I fully support it.

How to Make Keto Garlic Mushroom Chicken Casserole

Step 1: Preheat and get cozy

Preheat your oven to 375°F (190°C). This is your casserole’s warm little spa day where everything melts together.

Step 2: Sauté the mushrooms

Heat olive oil in a large skillet over medium heat. Add your sliced mushrooms and sauté for 5–7 minutes, until they’re golden and have released their moisture.

Translation: you want them browned and delicious, not watery and sad.

Step 3: Add garlic (and try not to eat it straight)

Add the minced garlic to the mushrooms and cook for 1–2 minutes, stirring often.

Garlic burns fast, and burnt garlic tastes like regret. Keep it moving.

Step 4: Mix the creamy filling

In a large mixing bowl, combine:

• cooked chicken
• sautéed mushrooms and garlic
• heavy cream
• thyme + oregano
• salt + pepper

Stir until everything is coated and creamy.

Step 5: Assemble the casserole

Transfer the mixture into a greased 9×13-inch casserole dish and spread it out evenly.

Step 6: Add the cheese blanket

Sprinkle mozzarella and Parmesan over the top like you mean it. This is not the moment to be shy.

Step 7: Bake until bubbly perfection

Bake for 25–30 minutes, until the cheese is bubbly and golden brown.

Step 8: Garnish and serve

Let it cool for a few minutes (just enough so you don’t scorch your mouth), then sprinkle with fresh parsley.

Serve hot and enjoy your creamy, low-carb comfort food moment.

Tips for the Best Results

• Don’t skip sautéing the mushrooms. If you toss them in raw, they’ll release liquid in the oven and your casserole might turn into soup. (A tasty soup… but still.)
• Want it thicker? Let the casserole rest 10 minutes before serving. It firms up as it cools slightly.
• Craving a little kick? Add a pinch of red pepper flakes to the chicken mixture.
• Need more veggies? Stir in a handful of spinach at the mixing stage. It wilts beautifully and nobody has to know you were being responsible.

And if your cheese browns faster than expected? Congratulations—you discovered the mysterious power of your oven’s personality. Every oven has one.

A Little Story From My Kitchen

This Keto Garlic Mushroom Chicken Casserole became one of my go-to “everyone’s hungry and I need dinner to behave” recipes. The first time I made it, I was trying to use up leftover chicken and a box of mushrooms that was giving me that cook me or lose me look.

I pulled it out of the oven, and the smell was so good that suddenly everyone appeared in the kitchen like I rang a dinner bell. That’s when I knew: this one belongs in the regular rotation.

FAQs About Keto Garlic Mushroom Chicken Casserole

The Cozy Dinner You’ll Make Again

There’s something deeply satisfying about pulling a bubbling, golden casserole from the oven—especially when it’s low-carb and still tastes like comfort food. This Keto Garlic Mushroom Chicken Casserole is creamy, cheesy, and full of garlicky goodness, and it fits right into real life: busy schedules, hungry families, and the occasional “I cannot cook another complicated thing” evening.

If you make it, sprinkle that parsley like a proud kitchen magician… because you just turned simple ingredients into dinner magic.

Keep the Keto Comfort Going

If this Keto Garlic Mushroom Chicken Casserole just saved your dinner mood (and your carbs), don’t stop here—there are more cozy, creamy, weeknight-friendly favorites waiting for you. Here are a few you’ll probably want to bookmark right now:

• Creamy Garlic Mushroom Chicken Thighs (rich, cozy, and saucy) – Same garlicky-mushroom goodness, but in a skillet dinner that feels like a hug.
• Keto Chicken Bacon Ranch Casserole (cheesy, hearty, family-approved) – When you want that bubbly cheese top again… plus bacon (because of course).
• Chicken Spinach and Mushroom Low-Carb Casserole (creamy + veggie-packed) – If you loved the mushrooms here, this one’s your next “make it again” meal.
• Garlic Parmesan Chicken Soup (warm, comforting, and so easy) – Perfect for chilly nights when you want the same flavors in a cozy bowl.

If you try this recipe (or any of these!), I’d love to hear what you think—scroll down and leave a ⭐⭐⭐⭐⭐ star review. Your stars and sweet comments help other home cooks find their next favorite dinner (and they truly make my day!).

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