Cheesy Mushroom Casserole

Mushroom Casserole with bacon and cheese!  Enjoy this easy side dish as a compliment to any dish or incorporate a protein like leftover turkey and serve as a complete meal!


Cheesy mushroom casserole with bacon on a white plate with fresh green beans #mushroom #Casserole #Keto |


Rich and delicious creamy mushroom casserole is a new side dish that I have added to my Thanksgiving menu.

Not only is this simple to make, but it’s also quite versatile!

Happen to have leftover cooked chicken or turkey (thinking ahead!)?  You could easily add it to the mushroom mix for a complete hearty meal!

I recommend baby belle mushrooms also known as criminis for this dish.  They’re firmer and meatier than white mushrooms, so these will hold up better if you want to make this in advance.


mushroom casserole ingredients - chopped onion and chopped baby bella mushrooms. #mushrooms #lowCarb #casserole |


This casserole is very filling and compliments the keto/low carb diet that I’ve been incorporating into my dishes.  The higher fats really do keep you satisfied longer and tastes so much better than the non-fat and lower-fat cheese, sour cream, and cooking sprays!

I still feel like I’m in the testing phase of this keto journey of moderate proteins, higher fats and low carb foods.  Check out this Guide to Keto Diet if you are interested in learning more.

I’ve been on this journey to get my health under control for about a year.  I know this because every October I go in for my wellness check up.   Last year I went to my doctor feeling frustrated with how I was inching towards the overweight section of the health chart and I just didn’t feel my best.  I’ve always been a low carb eater, exerciser, so what was the problem???

Basically, my doctor said it sucks to get old (hormones), and I need to eat less and exercise more.


Cheesy mushroom casserole baked in a teal 8 x8 inch pan #Casserole #Vegetarian #Mushrooms |



That rationalization did not sit well with me.  Not one bit, especially since she really didn’t know my lifestyle.

So I read every single article I could get my eyes on and began looking into the ketogenic diet.   At that time exercise was a stressor for my body and I wasn’t sleeping well so I stopped running (I now walk and occasional hit the gym), but nothing like I was doing before.

I initially completely cut out white flours, rice, potatoes, fruits, sugars and kept my carbs about 25 grams.  I don’t count calories, but I found it helpful to track carbs when I stalled with weight loss.  It gave me a better perspective of what my body tolerated.

I now know that I’m super-super sensitive to gluclose spikes and can easily get thrown out of ketosis if I eat anything with granulated sugar for example, so although I will indulge occasionally in whatever I want, I quickly go back to making sure my gluclose levels are stable.

My hormones were definitely out of whack too, and my doc did help me with that, so I think that has contributed to my success.

My wellness check up this year rings me in 17 pounds lighter than last year.  And just this week someone called me SKINNY!  What?? 

The actually words were, “You look skinny, like you are really slimming down!”  I’ve said that in my head about a dozen times already – lol!

It’s nice to hear that since I feel validated for sticking to what I know is best for ME and I do feel so much better and slimmer!


Cheesy mushroom casserole with bacon on a white plate with fresh green beans #casserole #Keto #mushroom #Bacon |


Enjoy this mushroom casserole with this easy German pork schnitzel or how about trying this low carb cheeseburger meatloaf!


Cheesy mushroom casserole baked in a teal 8 x8 inch pan #Casserole #Vegetarian #Mushrooms |

Cheesy Mushroom Casserole

Rich and creamy mushroom casserole with bacon and cheese!  Enjoy this easy side dish as a compliment to any main meal or incorporate a protein like leftover turkey and serve as a complete dish!
4.67 from 6 votes
Print Pin Rate
Course: Side Dish
Cuisine: American
Prep Time: 15 minutes
Cook Time: 25 minutes
Total Time: 40 minutes
Servings: 6 servings
Calories: 326kcal
Author: Sandra Shaffer


  • 1 pound baby bella mushrooms
  • 1 small onion diced
  • 1 cup sour cream
  • 2 tablespoons cream cheese
  • 6 slices bacon
  • 1 cup sharp cheddar cheese shredded
  • salt and pepper to taste


  • Pre-heat oven to 350 degrees. Dice bacon slices and in a large skillet cook until crispy. Remove bacon from pan and let drain on paper towel.
  • Clean and dice mushrooms and place in bacon grease (medium-high heat) with onions and season with salt and pepper. Saute until mushrooms are tender and the onions begin to caramelize.  
  • Mix in sour cream and cream cheese incorporating all the ingredients until creamy. Place ingredients in a 8" X 8" pan, then add cooked bacon and top with shredded cheese. 
  • Bake for 10- 15 minutes or until cheese has melted. 


 If you don't have enough bacon grease to saute the mushrooms and onion, then add additional 1-2 tablespoons of fat. 


Serving: 1g | Calories: 326kcal | Carbohydrates: 8g | Protein: 16g | Fat: 26g | Saturated Fat: 14g | Polyunsaturated Fat: 9g | Trans Fat: 1g | Cholesterol: 76mg | Sodium: 514mg | Fiber: 2g | Sugar: 4g


Please note that the nutritional information provided are guidelines and may vary based on the brand of products used. For your specific nutritional goals use My Fitness Pal or Verywell Fit recipe calculators. All content within this site is not intended as medical diagnosis or treatment and should not be considered a substitute for professional medical expertise.


Mushroom Casserole with fresh green beans on a white plate with the casserole in the foreground #casserole #mushroom #lowCarb #Keto |

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  1. What a great story and something I can definitely relate to! I used to exercise a lot and pretty much eat what I wanted but that does’t work any longer. So now I’m on a more or less low carb diet and doing a lot of walking and yoga and feel so much better. I love the sound of this casserole! And I would def add some turkey or chicken and make it an easy meal for a weeknight. By the way, would portobellos works well for this as well?

    1. Hi Linda! I haven’t tried the portobello mushrooms, but I don’t see why they wouldn’t be just as delicious. Let me know how it goes! Have you tried hot yoga? I thought I was going to die – haha!

  2. I came back to re-read your post because I first saw it the day I was heading out of town. I am grabbing some mushrooms today and making this for our dinner tonight and adding some chicken to it. I have been following the Ketogenic diet pretty strictly since Sept 30. I feel so much better. Not as tired, and I do NOT get those afternoon slumps where I feel like I want to lie down and take a nap. Not to mention the weight loss benefit. When I went to my endocrinologist last week (underactive thyroid), he was VERY pleased at how much weight I had lost! He didn’t bat an eye at me when I told him I’d been following the Keto diet (thankfully). Anyway, I just wanted to say more here but didn’t have time to the other day! I’m looking forward to making your recipe tonight! 🙂

    1. I’m soooo happy for your success, Shelby! It’s amazing what a difference eating the Keto-style diet can do for our bodies. Some of my co-workers have starting the diet as I’m hearing more and more doctors are supporting this diet, which is GREAT. As long as we fuel with satisfying and delicious recipes, we’re happy campers. 🙂

      1. 🙂 made it and it is delicious! I used pre-cooked chicken from TJ’s – Grumpy thought I should have added noodles. lol I told him not as long as I am eating it. I loved it – so much flavor!

  3. 17 pounds? That’s AMAZING! Congratulations you skinny girl you! That’s wonderful! I am going to read up about this too because as I am (ahem…) getting older pounds go on easier and come off a lot harder. And if I can loose weight serving up a delicious side dish like this? That’s a diet I wouldn’t mind being on!