Gather Your Ingredients
For the Chicken:
- 1.5 lbs boneless, skinless chicken breasts, cut into 1-inch pieces
- 1 tablespoon olive oil
- 1 teaspoon garlic powder
- 1/2 teaspoon paprika
- 1/4 teaspoon salt
- 1/4 teaspoon black pepper
For the Mushroom Sauce:
- 1 tablespoon olive oil
- 1 large onion, chopped
- 4 cloves garlic, minced
- 1 lb mushrooms, sliced
- 1/2 cup chicken broth
- 1 cup heavy cream
- 1/4 cup grated Parmesan cheese
- 1 tablespoon fresh thyme leaves (or 1 teaspoon dried)
- 1/4 teaspoon salt (or to taste)
- 1/4 teaspoon black pepper (or to taste)
For the Casserole:
- 1/2 cup shredded mozzarella cheese
- 2 tablespoons chopped fresh parsley, for garnish (optional)
The Magic Behind this Casserole: Why It’s a Must-Try
Okay, let’s be real. We all crave those Hearty Keto Dinners that are both satisfying and keep us on track. This Garlic Mushroom Chicken Casserole hits all the right notes. It’s packed with protein from the chicken, healthy fats from the cream and cheese, and plenty of flavor from the garlic and mushrooms. Plus, it’s incredibly versatile – you can easily adapt it to your liking by adding different veggies or spices. Think of it as a blank canvas for your culinary creativity!
And if you’re on the lookout for delicious Keto Chicken Fillet Recipes, this is another winner to add to your rotation. You get that tender chicken fillet experience combined with the comforting elements of a casserole.
Step-by-Step Instructions: Let’s Get Cooking!
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Prepare the Chicken:
In a large bowl, toss the chicken pieces with olive oil, garlic powder, paprika, salt, and pepper. Make sure the chicken is evenly coated with the spices.
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Sear the Chicken:
Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the chicken and cook for about 5-7 minutes, or until browned on all sides. Don’t overcrowd the pan; you may need to work in batches. The chicken doesn’t need to be cooked all the way through at this point, as it will finish cooking in the oven.
Remove the chicken from the skillet and set aside.
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Make the Mushroom Sauce:
In the same skillet, add another tablespoon of olive oil. Add the chopped onion and cook until softened, about 5 minutes. Add the minced garlic and cook for another minute until fragrant.
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Sauté the Mushrooms:
Add the sliced mushrooms to the skillet and cook until they are softened and have released their moisture, about 8-10 minutes. Don’t be afraid to let them brown a little – that’s where the flavor comes from!
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Create the Creamy Sauce:
Pour in the chicken broth and scrape up any browned bits from the bottom of the skillet. This is where a lot of flavor is hiding! Let the broth simmer for a few minutes to reduce slightly.
Stir in the heavy cream, Parmesan cheese, thyme, salt, and pepper. Bring the sauce to a simmer and cook for a few more minutes until it thickens slightly. Taste and adjust the seasoning as needed.
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Assemble the Casserole:
Preheat your oven to 375°F (190°C).
Pour the mushroom sauce into a 9×13 inch baking dish. Spread the cooked chicken pieces evenly over the sauce.
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Bake to Perfection:
Sprinkle the shredded mozzarella cheese over the top of the casserole.
Bake for 20-25 minutes, or until the cheese is melted, bubbly, and lightly golden brown. The internal temperature of the chicken should reach 165°F (74°C).
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Garnish and Serve:
Remove the casserole from the oven and let it rest for a few minutes before serving. Garnish with chopped fresh parsley, if desired.
Tips & Tricks for Casserole Success
- Don’t Overcrowd the Pan: When searing the chicken, work in batches to ensure it browns properly. Overcrowding the pan will cause the chicken to steam instead of brown.
- Mushroom Matters: Use a variety of mushrooms for a more complex flavor. Cremini, shiitake, or oyster mushrooms would all be delicious additions.
- Thickening the Sauce: If your sauce isn’t thickening enough, you can add a slurry of 1 tablespoon of cornstarch mixed with 2 tablespoons of cold water. Stir it into the sauce and simmer until thickened. But honestly, good heavy cream usually does the trick!
- Cheese Choices: Feel free to experiment with different cheeses. Gruyere, provolone, or even a sprinkle of goat cheese would be tasty alternatives.
- Make-Ahead Magic: You can assemble the casserole ahead of time and store it in the refrigerator for up to 24 hours. Just add a few extra minutes to the baking time.
Variations to Spice Things Up
- Add Veggies: Toss in some broccoli florets, bell peppers, or spinach for added nutrients and flavor. This can make it a true winner of Chicken And Veggies Dinner Recipes.
- Spice It Up: Add a pinch of red pepper flakes to the sauce for a little heat.
- Herb Heaven: Experiment with different herbs like rosemary, oregano, or chives.
- Wine Time: Deglaze the pan with a splash of dry white wine after cooking the onions and garlic for a richer flavor.
- Bacon Bliss: Crispy bacon bits sprinkled on top of the casserole would add a salty, smoky flavor.
- Onion Options: Instead of yellow onion, try using shallots for a milder, more delicate flavor.
- Cream Cheese: Mix in 2-4 ounces of cream cheese to the sauce for extra richness and tang.
Serving Suggestions: Complete the Meal
This Garlic Mushroom Chicken Casserole is delicious on its own, but here are a few serving suggestions to complete the meal:- Cauliflower Rice: A low-carb alternative to traditional rice.
- Steamed Green Beans: A simple and healthy side dish.
- Side Salad: A crisp salad with a light vinaigrette.
- Zucchini Noodles: Another low-carb option for a complete keto meal.
Beyond the Casserole: Explore Related Recipes
If you enjoyed this recipe, you might also like these other flavorful options: For another creamy, garlicky delight, try the Creamy Garlic Butter Chicken & Linguine. It’s a great way to get that creamy garlic flavor in a different presentation. If you’re in the mood for something cozy and comforting, the Creamy Keto White Chicken Chili is a fantastic choice. Craving more mushrooms with your chicken? Don’t miss the Amazing Creamy Keto Skillet Chicken Thighs With Mushroom Sauce. And of course, if you love this casserole, be sure to bookmark the Garlic Mushroom Chicken Casserole recipe for easy reference! For a fun and flavorful appetizer or snack, check out the Keto Chicken Skewers. Or, for a delicious and satisfying handheld meal, try the Keto Philly Cheesesteak Rolls.Storing and Reheating: Making the Most of Your Leftovers
- Storing: Leftover Garlic Mushroom Chicken Casserole can be stored in an airtight container in the refrigerator for up to 3-4 days.
- Reheating: You can reheat the casserole in the oven at 350°F (175°C) for about 15-20 minutes, or until heated through. You can also reheat it in the microwave, but the texture may be slightly different.
Final Thoughts: Your New Go-To Casserole
This Garlic Mushroom Chicken Casserole is more than just a recipe; it’s a warm hug on a plate. It’s perfect for busy weeknights, potlucks, or any time you’re craving comfort food. With its easy preparation, delicious flavors, and endless possibilities for customization, I’m confident that this will become one of your new favorite Hearty Keto Dinners. So go ahead, give it a try – you won’t be disappointed!Can I prepare the Garlic Mushroom Chicken Casserole ahead of time?
Yes, you can assemble the casserole ahead of time and store it in the refrigerator for up to 24 hours. Just add a few extra minutes to the baking time.
What are some variations I can try with this casserole recipe?
You can add vegetables like broccoli, bell peppers, or spinach. You can also add red pepper flakes for spice, experiment with different herbs, deglaze the pan with white wine, add bacon bits, use shallots instead of yellow onion, or mix in cream cheese for extra richness.
What are some serving suggestions for the Garlic Mushroom Chicken Casserole?
The casserole pairs well with cauliflower rice, steamed green beans, a side salad, or zucchini noodles.
How should I store and reheat leftover casserole?
Store leftovers in an airtight container in the refrigerator for up to 3-4 days. Reheat in the oven at 350°F (175°C) for 15-20 minutes, or until heated through, or in the microwave.

BEST Garlic Mushroom Chicken Casserole
Equipment
- Large bowl
- Measuring spoons
- Measuring cups
- Large skillet
- 9×13 inch baking dish
- Oven
- Knife
- Cutting board
- Spatula
Ingredients
- 1.5 lbs boneless, skinless chicken breasts, cut into 1-inch pieces
- 2 tablespoons olive oil
- 1 teaspoon garlic powder
- ½ teaspoon paprika
- ¼ teaspoon salt
- ¼ teaspoon black pepper
- 1 large onion, chopped
- 4 cloves garlic, minced
- 1 lb mushrooms, sliced
- ½ cup chicken broth
- 1 cup heavy cream
- ¼ cup grated Parmesan cheese
- 1 tablespoon fresh thyme leaves or 1 teaspoon dried
- ½ cup shredded mozzarella cheese
- 2 tablespoons chopped fresh parsley, for garnish
Instructions
- Preheat oven to 375°F (190°C).
- In a large bowl, toss the chicken pieces with 1 tablespoon of olive oil, garlic powder, paprika, salt, and pepper. Ensure the chicken is evenly coated.
- Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the chicken and cook for about 5-7 minutes, until browned on all sides. Work in batches to avoid overcrowding. Remove from skillet and set aside.
- In the same skillet, add another tablespoon of olive oil. Add the chopped onion and cook until softened, about 5 minutes. Add the minced garlic and cook for another minute until fragrant.
- Add the sliced mushrooms to the skillet and cook until softened and their moisture has released, about 8-10 minutes.
- Pour in the chicken broth and scrape up any browned bits from the bottom of the skillet. Simmer for a few minutes to reduce slightly.
- Stir in the heavy cream, Parmesan cheese, thyme, salt, and pepper. Bring the sauce to a simmer and cook for a few more minutes until it thickens slightly. Taste and adjust the seasoning as needed.
- Pour the mushroom sauce into a 9×13 inch baking dish. Spread the cooked chicken pieces evenly over the sauce.
- Sprinkle the shredded mozzarella cheese over the top of the casserole.
- Bake for 20-25 minutes, or until the cheese is melted, bubbly, and lightly golden brown. The internal temperature of the chicken should reach 165°F (74°C).
- Remove from the oven and let it rest for a few minutes before serving. Garnish with chopped fresh parsley, if desired.
