Keto Chicken Mushroom Casserole: A Comforting Dish with a Twist
Okay, let’s be real for a second. Finding decent Keto recipes can feel like searching for a needle in a haystack sometimes. I mean, who has time to sift through a gazillion ingredients or hard-to-find spices? But you know what? I think I’ve finally cracked the code with this Keto Chicken Mushroom Casserole. It’s a family favorite, and trust me, that says a lot when my 8-year-old refuses to eat anything green. But somehow, she loves this casserole!
Ingredients You’ll Need for Keto Chicken Mushroom Casserole**
Here’s the grocery list you’ll want to gather. Just a heads up, I tried to keep this as straightforward as possible—the last thing I need is to be running around the store, searching for some obscure ingredient. So here we go:
- 6 cups cooked shredded chicken (Use leftovers if you can; it makes life easier! Mom always said using leftover rotisserie chicken is a game changer.)
- 1 tbsp butter (Or ghee if you want to fancy it up)
- 1 tbsp olive oil (Extra virgin if you’re feeling gourmet)
- 0.5 small onion (sliced, but don’t worry if you cry. Onions, right?)
- 1 clove garlic (chopped; fresh is best, but I’ve used jarred in a pinch)
- 12 oz white mushrooms (sliced; get the ones that look plump and fresh)
- 4 oz beef broth (homemade is awesome, but store-bought works too)
- 4 oz cream cheese (cut into cubes; this part is key for creamy texture)
- 2 oz heavy cream (again, cannot stress enough how creamy this makes it)
- 0.5 tsp salt (sea salt if you’re fancy, regular salt if you’re normal like me)
- 0.25 tsp pepper (or to taste, because spice is life!)
- 1 cup shredded mozzarella (bonus points if you find a brand that pulls beautifully)

Instructions to Make Your Casserole
Alright, let’s jump into the kitchen! Here’s how you can whip this beauty up. Ready?
Preheat your oven to 400°F (200°C). The key is—oh wait, I forgot to mention—you need to preheat your oven first, otherwise you’ll be waiting forever.
Grease a 9×13 inch casserole dish. I like using cooking spray for this—easy peasy.
Spread the cooked shredded chicken evenly across the bottom. Make sure it’s even! This is the base of your goodness.
In a large skillet, melt the butter and olive oil over medium heat until it shimmers. Honestly, this is the part where the kitchen starts smelling amazing. It gets me every time.
Add the sliced onion and chopped garlic. Cook until they’re soft and fragrant, about 3-5 minutes. Last Tuesday, I completely burned the garlic because my neighbor knocked on the door. A total distraction! Just keep an eye on it.
Stir in the sliced white mushrooms and continue to cook. Honestly, don’t worry about any liquid from the mushrooms; it adds great flavor to your sauce! Let them sizzle until tender.
Spoon this delicious mushroom, onion, and garlic mixture over the chicken. This is where your chicken gets dressed for the party.
Return to the skillet and pour in the beef broth. Stir in the cubed cream cheese, making sure to get it well incorporated.
Add the heavy cream, salt, and pepper. Stir until the sauce is smooth. For an extra silky texture, you can use an immersion blender directly in the skillet. I think… no, I know this works better when you do this step!
Generously pour this creamy sauce over the chicken and mushrooms in your casserole dish. This is the money shot, folks.
Sprinkle the shredded mozzarella cheese evenly across the top. Just look at that, it’s a blanket of cheesy goodness!
Bake for 20-25 minutes or until the casserole is hot, bubbly, and the cheese is golden and melted. Make sure to keep an eye on it; no one wants the cheese to burn.
Personal Tips for the Best Casserole Ever
So, here’s where I get real with you. I learned that it’s essential to keep your chicken moist and not overcook it. Make sure not to ignore those cooking times!
And here’s a little tidbit: if you really want an easy meal, make double the amount of chicken one night and just shred it for this dish later on. Prep like a pro! 🙂
Also, I can’t stress enough how handy a cast iron skillet is for these types of recipes. Seriously, if you don’t have one, you’re missing out.
Serving Suggestions & Final Thoughts
Speaking of serving, I like to pair this casserole with a simple side salad—something my sister recommended. Keeps it light and fresh, you know?
Now, here’s the thing—this casserole often tastes even better the next day, so don’t be afraid to make it ahead of time. Leftovers for lunch? Yes, please!
Alright, that’s it! I hope you enjoy this Keto Chicken Mushroom Casserole as much as I do. It’s like a warm hug on a plate. Let me know how yours turns out, and don’t forget to share your own little twists! Happy cooking, friends! 🙂

Keto Chicken Mushroom Casserole
Ingredients
Method
- Preheat your oven to 400°F (200°C).
- Grease a 9×13 inch casserole dish with cooking spray.
- Spread the cooked shredded chicken evenly across the bottom of the casserole dish.
- In a large skillet, melt the butter and olive oil over medium heat.
- Add the sliced onion and chopped garlic. Cook until soft and fragrant, about 3-5 minutes.
- Stir in the sliced white mushrooms and continue to cook until tender.
- Spoon the mushroom, onion, and garlic mixture over the chicken.
- Pour in the beef broth and stir in the cubed cream cheese until well incorporated.
- Add the heavy cream, salt, and pepper. Stir until smooth, using an immersion blender if desired.
- Pour the creamy sauce over the chicken and mushrooms.
- Sprinkle the shredded mozzarella cheese evenly across the top.
- Bake for 20-25 minutes or until hot and bubbly and the cheese is golden.
