I still remember the first time I tossed chicken, mushrooms, cream, and cheddar into the crockpot—what came out was a silky, low-carb casserole that felt indulgent but stayed firmly keto. This Keto Chicken and Mushroom Casserole is a hands-off weeknight hero: minimal prep, comforting flavors, and that creamy finish everyone reaches for seconds of. If you want a simple make-ahead dinner that plays well with cauliflower mash or a crisp salad, this is the one to keep in rotation. For another slow-cooker mushroom-chicken idea with a garlicky twist, try this keto garlic mushroom chicken casserole.

Why you’ll love this dish

This casserole hits the sweet spot for busy cooks who don’t want to sacrifice flavor for convenience. It’s low-carb and keto-friendly thanks to heavy cream and cheddar replacing starchy thickeners. The crockpot keeps the chicken tender and lets mushrooms release deep savory notes into the sauce. It’s perfect for weeknights, easy meal prep, and even potlucks where you want a crowd-pleasing, comfort-food option that’s still health-conscious.

“Creamy, cozy, and surprisingly rich for only a few simple ingredients—my whole family devoured it.” — Home tester

Because it’s so adaptable, you can scale it for two or twelve and pair it with salads, sides, or keto-friendly bread. If you want a faster stove-top alternative with similar flavors, check out this chicken and mushroom stir-fry for a quick skillet version.

Step-by-step overview

Cube chicken and slice mushrooms; mince garlic.
Layer chicken, mushrooms, and seasonings in the crockpot.
Add chicken broth and heavy cream; stir.
Slow-cook low (6–8 hrs) or high (3–4 hrs).
Stir in shredded cheddar about 30 minutes before serving to melt through.
Garnish with fresh parsley and serve warm.

This quick roadmap helps you gather ingredients and know when to check the dish, especially if you’re timing other meal components.

What you’ll need

1 lb chicken breast, cubed (boneless, skinless)
8 oz mushrooms, sliced (white or cremini)
1 cup heavy cream
1 cup shredded cheddar cheese (sharp gives more flavor)
1/2 cup chicken broth (low-sodium preferred)
2 cloves garlic, minced
1 teaspoon onion powder
Salt and pepper to taste
Fresh parsley, for garnish

Notes/substitutions: Use half-and-half if you need fewer calories, but the sauce will be thinner. Swap in Gruyère or mozzarella for different melting profiles. For a dairy-free keto option, use a cream substitute and omit the cheese—expect a different texture. For inspiration on combining roast chicken with mushrooms in a soup format, see this rotisserie chicken and mushroom soup.

Directions to follow

Prep ingredients: cube the chicken, slice mushrooms, and mince garlic. Pat chicken dry so it browns lightly if you choose to sear first (optional).
Place the cubed chicken and sliced mushrooms into the crockpot. Add the minced garlic, onion powder, salt, and pepper, and toss to distribute seasonings.
Pour the chicken broth and heavy cream over the chicken mixture. Stir gently so everything is evenly combined.
Cover and cook: set the crockpot to low for 6–8 hours or high for 3–4 hours. The chicken should register 165°F (74°C) and be tender.
About 30 minutes before serving, sprinkle the shredded cheddar over the top and stir until melted and incorporated into the sauce. If the sauce looks too thin, remove the lid for the last 20–30 minutes to thicken slightly.
Taste and adjust salt and pepper. Spoon into bowls and finish with chopped fresh parsley before serving.

Short, clear action verbs make these steps easy to scan while you cook.

Best ways to enjoy it

This casserole is creamy and rich, so lighter or textured sides work best:

Cauliflower mash or riced cauliflower for a full keto plate.
A crisp, acidic salad (arugula with lemon vinaigrette) to cut the richness.
Roasted asparagus, green beans, or sautéed spinach.
Spoon over zucchini noodles for a lighter noodle-style meal.

For a make-it-family-friendly serving, place it over buttered egg noodles for non-keto guests.

Storage and reheating tips

Refrigerator: Cool completely, then store in an airtight container for up to 3–4 days. Reheat gently on the stove over low heat or in a 325°F oven covered until warmed through.
Freezer: Portion into freezer-safe containers and freeze up to 2 months. Thaw overnight in the fridge before reheating. Texture may change slightly after freezing due to cream separation—stir gently while reheating.
Food safety: Always cool leftovers within two hours and reheat to 165°F (74°C) before serving.

Pro chef tips

Optional sear: Searing cubed chicken in a hot skillet for 2 minutes per side before adding to the crockpot adds flavor but isn’t necessary.
Control sauce thickness: If the finished sauce is thinner than you like, whisk 1–2 teaspoons of xanthan gum into a small amount of cold water and stir into the hot casserole—xanthan is keto-friendly and thickens without lumps.
Cheese timing: Adding cheddar too early can cause it to break or separate; stirring it in near the end preserves creaminess.
Flavor boost: A splash (1 tsp) of white wine or 1/2 teaspoon Dijon mustard added with the broth lifts the sauce. For a herby note, toss in a sprig of thyme while cooking and remove before serving. For technique inspiration on comforting chicken casseroles, review this Dolly’s chicken and stuffing casserole.

Creative twists

Bacon & thyme: Add cooked crisp bacon and fresh thyme for a smoky-herby version.
Spinach & artichoke: Fold in chopped spinach and quartered artichoke hearts for a creamy dip–inspired bake (adjust salt).
Mediterranean: Replace cheddar with crumbled feta and add olives and sun-dried tomatoes for a Greek twist—skip if keeping strict keto sodium levels.
Low-dairy: Use a creamy cashew sauce and nutritional yeast to mimic the cheesy flavor while keeping it dairy-free (not strictly keto if using cashews liberally).

FAQ

Q: Can I use thighs instead of breasts?
A: Yes—boneless skinless thighs are juicier and less likely to dry out in long cook times. Reduce the high setting time slightly if pieces are large, and ensure internal temp reaches 165°F (74°C).

Q: Is this recipe freezer-friendly?
A: Yes. Freeze in single-portion containers for up to 2 months. Thaw overnight in the fridge and reheat gently; stir well to reincorporate any separated cream.

Q: Can I make this on the stovetop or in the oven?
A: Absolutely. For stovetop, simmer on low, covered, for 20–30 minutes until chicken is cooked and sauce reduced. For oven, bake covered at 350°F for 35–45 minutes, then uncover and add cheese to melt.

Q: How can I thicken the sauce without flour?
A: Use a small amount of xanthan gum (start with 1/4 teaspoon), reduce the sauce by cooking uncovered, or stir in more cheese at the end for body.

Q: Is the recipe suitable for weeknight meal prep?
A: Yes. Prep and store in the fridge, then reheat portions. You can also assemble in the crockpot insert and refrigerate a few hours before starting the cook cycle.

Conclusion

This Keto Chicken and Mushroom Casserole is an easy, satisfying dish that proves you don’t need carbs to get comforting creaminess. If you’d like a one-pan variant with similar flavors, here’s a solid reference: Keto Chicken Mushroom Casserole (One Pan) – Sugar-Free Mom. For another creamy, low-carb take on the classic, see this recipe for inspiration: Keto Chicken Mushroom Casserole – Creamy Low Carb Goodness!

Keto Chicken and Mushroom Casserole

A creamy, low-carb casserole made with chicken, mushrooms, and cheddar cheese, perfect for busy weeknights and meal prep.

Prep Time 15

Cook Time 8

Total Time 8 15

Serving Size servings

Ingredients

Main Ingredients

1 lb chicken breast, cubed (boneless, skinless)
8 oz mushrooms, sliced (white or cremini)
1 cup heavy cream
1 cup shredded cheddar cheese sharp gives more flavor
1/2 cup chicken broth low-sodium preferred
2 cloves garlic, minced
1 teaspoon onion powder
Salt and pepper to taste
Fresh parsley, for garnish

Instructions

Preparation

Cube the chicken, slice the mushrooms, and mince the garlic.
Pat the chicken dry to achieve a light brown if searing.

Cooking

Place the cubed chicken and sliced mushrooms into the crockpot.
Add the minced garlic, onion powder, salt, and pepper; toss to distribute seasonings.
Pour the chicken broth and heavy cream over the chicken mixture. Stir gently to combine.
Cover and cook on low for 6–8 hours or high for 3–4 hours (chicken should reach 165°F).
30 minutes before serving, sprinkle shredded cheddar over the top and stir until melted and incorporated.
Taste and adjust seasoning, then garnish with fresh parsley before serving.

Notes

For a lighter version, consider pairing with cauliflower mash, riced cauliflower, or a crisp salad. It can be stored in the refrigerator for up to 3–4 days or frozen for 2 months.