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Cheesy Sloppy Joe Casserole (keto)

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A cheesy sloppy Joe casserole that’s like Manwhich, but gluten-free and keto friendly!

This sloppy joe remix is an easy and cheesy sloppy Joe casserole without all the carbs! This is by far the BEST keto sloppy Joe recipe out there.

cheesy sloppy joes

Comfort food remix: sloppy Joe casserole recipe

I remember the sweet and savory sloppy Joes my mom used to make as a kid. Alright, they were straight out of the can, but still tasted like heaven.

I wanted to mimic that comfort food here, but without all the added sugar and unpronounceable ingredients.

This beefy, cheesy keto friendly sloppy Joe casserole is delicious and budget friendly.


sloppy Joe covered mushrooms

What can I substitute for hamburger in sloppy Joes? 

If you don’t have hamburger meat, you may make this easy casserole with ground chicken, ground turkey, or pork. 

making sloppy joe in casserole cast iron dish

What can I add to sloppy Joe casserole?

Some great ways to jazz up your keto sloppy Joes include:

  • Adding jalapeño peppers
  • Add cauliflower or cauliflower rice
  • Make it extra cheesy by adding cheese right into the casserole dish with the hamburger meat mixture.

How many calories does regular sloppy Joes have? 

Regular sloppy Joe’s contain about 650 cal for each “Manwich.” 

These low carb sloppy joes have only 264 calories.

How many carbs does regular sloppy Joes have? 

There’s about 48 g of carbohydrates in each sloppy Joe sandwich made with a regular bun.

This keto-friendly sloppy Joe casserole has only 8g. carbs. 

melted cheese on top of sloppy joe hamburger meat

How do I make sloppy Joes spicy? 

If you’d like to make these sloppy Joe’s extra spicy, simply add fresh or pickled jalapeños, chilies or your favorite pepper.

What can I substitute for mushrooms? 

Not a fan of mushrooms? 

Simply substitute mushrooms for your favorite low-carb veggie. 

I recommend extra bell peppers or shredded cabbage! 

How do I make sloppy Joes in the instant pot? 

To make this recipe in the instant pot, follow the following instructions:

  1. Brown ground beef with onions on sauté setting at medium heat.
  2. Add another ingredients and stir
  3. Top with cheeses
large view of flavorful casserole filled with mushrooms peppers and onions

What are other ways to use leftover sloppy Joes? 

Using a low-carb tortilla, slice of bread, or bun, you can use leftover sloppy Joe’s and a sandwich or quesadilla.

Use this sloppy Joe casserole as a hot dog chili topping with coleslaw. 

Are sloppy Joes keto?

They can be! I’m always on the lookout for new and exciting ways to remove the buns and bread from my diet. My usual go-to is zucchini, but that just didn’t fit here.

Mushrooms and beef go tougher like peas and carrots, so shrooms were the obvious choice for a keto-friendly, low-carb and sugar-free sloppy Joe recipe.

What seasonings do I add to make cheesy Sloppy Joe casserole?

Monterey Jack cheese is oh so creamy and delicious atop the sloppy Joe mix of mushrooms and beef.

The dijon mustard and sweet/savory seasoning of the green bell pepper-onion mixture are just mouth-watering.

placing monterey cheese on top of casserole

How to make Cheesy Sloppy Joe Casserole:

Even on the keto diet, this cheesy sloppy Joe casserole is easy and delicious.

First, remove the stems from your mushrooms and chop the onion.

Next, brown your ground beef and add all other ingredients.

Now, add your ground beef mixture to a baking dish.

Finally, top with some delicious Monterey Jack cheese on top.

Bake until the cheese is golden and you’re all set!

manwich sloppy joe casserole with onions green peppers and mushrooms

What can I have instead of buns on keto sloppy joes?

Try the following alternatives to make sugar-free keto sloppy joes:

  • Serve on baked fathead dough or make fathead keto sloppy Joe pockets
  • Make keto sloppy Joe mix and bake inside peppers
  • Pour the keto sloppy Joe sauce over pork rinds, or serve with broccoli
  • Add keto sloppy Joe mix to lettuce wraps or on top of loaded mashed cauliflower
  • Make a keto Philly cheesesteak recipe by adding in caramelized onions and extra peppers with white American

Can I freeze this casserole?

Simply seal in an air-tight freezer bag for up to a few months time if you’re meal prepping!

Hold long will sloppy Joe casserole keep in the fridge? 

Keto sloppy Joe casserole should keep for about three days in the refrigerator.

Healthy Sloppy Joe Casserole

Cheesy Sloppy Joe Casserole (keto)

Sloppy joe covered mushroom casserole with Monterey jack cheese topping. Low-carb and keto friendly, a healthy and easy weeknight dinner idea.
4.23 from 45 votes
Print Pin Rate
Course: Main Course
Cuisine: American
Prep Time: 10 minutes
Cook Time: 25 minutes
Total Time: 35 minutes
Servings: 4
Calories: 264kcal
Author: Amber @ Low Carb Quick


  • 1 lb lean ground beef
  • 8 oz baby bella mushrooms chopped
  • 1/2 cup tomato sauce
  • 1 yellow onion diced
  • 1/2 large green bell pepper, diced finely
  • 2 tbsp Worcestershire sauce
  • 2 tbsp dijon mustard
  • 2 tbsp powdered erythritol
  • 1 tbsp xanthan gum (to thicken, optional)
  • 2 cups monterrey jack or pepper jack cheese


  • Preheat oven to 350º F. Remove stems from mushrooms and set aside.
  • Brown ground beef on med heat. Add all other ingredients, including mushrooms. Stir occasionally. Drain thoroughly.
  • Spray baking dish with non-stick spray. Add ground beef mixture.
  • Layer Monterey Jack cheese on casserole and bake for 15 minutes or until cheese is golden.



Expert Tips
Drain ground beef thoroughly and use lean ground beef for this recipe for best results
Keep in air-tight container in the fridge for up to 3 days.
Ground beef mixture may be frozen for later use and thawed overnight in the fridge.


Calories: 264kcal | Carbohydrates: 8g | Protein: 37g | Fat: 7.6g | Saturated Fat: 2.7g | Cholesterol: 101mg | Sodium: 411mg | Fiber: 2.4g

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Thursday 13th of January 2022

This was a big fail for us. There was way too much fat and since the recipe doesn’t say to drain, I didn’t. After I put the rest of the ingredients in, I couldn’t drain it. There are 8 of us and no one ate it. There was absolutely no flavor, and yes, I double checked to make sure I put everything in. I usually love your recipes but this one failed miserably.

Amber @ Low Carb Quick

Friday 14th of January 2022

Step two specifically mentions draining, I'm so sorry you missed it. I also recommend using a lean ground beef, as that makes all the difference. Thanks for stopping by and I appreciate your feedback.


Sunday 31st of January 2021

Really enjoyed this recipe, and my husband said it was a new favorite! Really liked the mushrooms in the casserole. I added a bit more tomato sauce (Used Rao's as has no added sugar and "fake" ingredients.") I fully drained the ground beef before adding the veggies; took the beef out of the pan and then put beef back in pan and added rest of ingredients. I didn't find it too "liquidy" this way. Was even better the next day as leftovers!


Tuesday 2nd of February 2021

Hi Joan, I'm so glad you and your family enjoyed the recipe. Happy cooking! -Amber @ LCQ


Wednesday 18th of November 2020

How much cheese do you put on top?


Tuesday 15th of December 2020

Just as much as you'd like. I usually use about a cup and a half.

Wendy Davis

Friday 6th of November 2020

You forgot to say how much cheese you used. I plan to try this tonight. Guess I'll just eyeball the cheese. Looking forward to trying this.


Tuesday 15th of December 2020

About a cup and a half; thanks for stopping by!

Carol V

Friday 7th of August 2020

How much cheese? The cheese is mentioned in the directions, but not in the ingredients. :) Thanks!

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