Deliciously satisfying without being heavy, these portobello mushroom meatloaf sandwiches are the perfect sandwich any time!
What do you do when you have leftover meatloaf? Of course, that’s assuming you CAN have leftover meatloaf. In my house, that’s a rarity.
If I want leftovers, I have to make extra and hide them. True story. My boys love their meatloaf and my family of 5 can easily eat a 3 pound meatloaf, with salad and vegetables in a single sitting.
So, when you make meatloaf, what do you do with leftovers? Well, you can just reheat it and enjoy it on your plate again. That’s always a good option. OR, you can make this meatloaf sandwich.
Our portobello mushroom meatloaf sandwich is keto friendly, low carb, and naturally gluten free.
Portobello mushrooms are a great player on the keto diet. They can go from being stuffed, sauteed, to being used as a keto bread option. They have loads of fiber and 2.5 net carbs per medium sized cap. (source)
These mushrooms have a deep, earthy flavor that mellows even more when cooked. They typically take on the flavor of the food they are served with, making them a delicious vehicle for many dishes.
Other Recipes To Enjoy
How do you clean a portobello mushroom for a meatloaf sandwich?
Mushrooms are have some dirt still on them at the store, as they are low to the ground. The trick is to get them clean without getting them waterlogged. Mushrooms will absorb water and not brown nicely if they have too much water. They can end up mushy and gross.
The best way to clean a mushroom is by wiping them off with a damp towel. Simply wipe them off just before using. You will want to be sure to check for brown or mushy spots as well, and remove those parts before adding them to the recipe.
Learn more about portobello mushrooms here.
Let’s grab our meatloaf, mushroom caps and get started! Need to make the meatloaf first? Grab that recipe here.
Ingredients:
- 3 Tablespoons avocado oil
- 4 Portabello Mushroom caps
- 4 slices (about 1/2 inch thick) of leftover meatloaf
- 2 slices provolone cheese
- 2 slices tomato of choice
- 4 Tablespoons Russian dressing
Instructions:
- Wipe mushrooms carefully to remove dirt and remove the caps.
- Using a spoon, gently scrape some of the gills to make room for the meat.
- In a large skillet, heat 1 Tablespoon avocado oil. Add mushroom caps to hot oil and fry on medium heat for 3 minutes per side. Remove and set aside.
- While the skillet is still hot, add remaining avocado oil and lay meatloaf slices down to crisp up and heat through. Cook 4 minutes on one side.
- Flip meatloaf slice over, add provolone cheese and allow cheese to melt.
- Drizzle Russian dressing over one side of mushroom cap, add hot meatloaf slices and top with a second cap. Serve hot and enjoy!
What is your favorite sandwich? Be sure to let me know what you think of this portobellow meatloaf sandwich!
Portobello Meatloaf Sandwiches (keto, gluten free)

Ingredients
- 4 Tablespoons avocado oil
- 4 Portabello Mushroom caps
- 4 slices (about 1/2 inch thick) of leftover meatloaf
- 2 slices provolone cheese
- 2 slices tomato of choice
- 4 Tablespoons Russian dressing
Instructions
- Wipe mushrooms carefully to remove dirt and remove the caps.Using a spoon, gently scrape some of the gills to make room for the meat.
- In a large skillet, heat 2 Tablespoons avocado oil. Add mushroom caps to hot oil and fry on medium heat for 3 minutes per side. Remove and set aside.
- While the skillet is still hot, add remaining avocado oil and lay meatloaf slices down to crisp up and heat through. Cook 4 minutes on one side.
- Flip meatloaf slice over, add provolone cheese and allow cheese to melt.
- Drizzle Russian dressing over one side of mushroom cap, add hot meatloaf slices and top with a second cap. Serve hot and enjoy!
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Nutrition Information:
Yield:
2Serving Size:
1 sandwichAmount Per Serving: Calories: 647 Total Fat: 53g Saturated Fat: 12g Trans Fat: 0g Unsaturated Fat: 37g Cholesterol: 81mg Sodium: 1023mg Carbohydrates: 9.7g Fiber: 3g Sugar: 11g Protein: 24g
Zach
Some of Zach's favorite keto resources include:
Perfect Keto: For those who are looking for easy supplements that support a Keto diet, Perfect Keto offers a variety of products that make it easy to stay in ketosis including keto bars, whey protein, and keto nootropics.
KetoLogic: For those who have a sweet tooth, KetoLogic sells keto-friendly chocolate candies with only 1g of net carbs & zero added sugars.
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Yum! The fella follows a mostly low-carb diet, so I’m always looking for new recipes to add to our dinner rotation. I certainly love mushrooms and he loves meatloaf so this checks both of our boxes!
that’s awesome I love when a recipe does that!!!
These sound amazing! My family loves mini sandwiches like this. I think I might try it with burgers. 🙂
let me know what you think!
Absolutely fantastic! Love the meatiness of the portobello in this hearty sandwich!
This looks great! I’ve never used mushrooms as a bun but love the idea.
let me know if you like it!!
I can’t remember the last time I had a meatloaf sandwich! This looks amazing. Great idea using the portobello!
I love using leftover meatloaf like this! And I’ve never thought to fry leftover slices so I’m going to try that as soon as possible.
What a great idea. I have to try this
I have been on such a mushroom binge this last year, so I definitely NEED TO TRY THESE! Thanks for sharing
I actually have portobellos in my fridge right now, and we eat hamburgers literally every day, lol! Going to make these tonight, thank you, fun!
Yes! Meatloaf and sandwiches to ring in the fall season! Great idea to use mushrooms as the ‘bun’!!
Such a great idea to eat meatloaf in a sandwich! I love that you put it in portobello buns too.