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Keto Stuffed Portobello Mushrooms 🍄

Cast Iron Keto
by
Updated:
3 Comments
4.86 from 7 votes

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Introducing our Keto Stuffed Portobello Mushrooms, a delicious low-carb appetizer. Filled with veggies, ground beef, and bacon, these mushroom caps resemble cheeseburgers! Enjoy the fusion of juicy "cheeseburgers" without the carb-loaded bun. Sounds delicious? Let's make it!

Keto Cheeseburger Stuffed Portobello Mushroom Caps in a cast iron skillet
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Preparation and cooking overview

Preparing these Keto Stuffed Mushrooms is really easy — it only takes 30 minutes! Start by cooking ground beef in a skillet. Once cooked, add bacon and shredded veggies to the mix. Now put this filling inside your portobello caps and bake for 10 minutes.

Chef's note

Add spicy jalapeños and blue cheese to your beef stuffing to make these stuffed mushrooms interesting. This will ramp up the spice levels of the dish and make it more flavorful.

a single Keto Cheeseburger Stuffed Portobello Mushroom Cap on a black plate

Do you know you can use the same filling to make Keto Stuffed Bell Peppers? Try it out for a flavor twist!

  • Prep Time: 10 minutes
  • Cooking Time: 20 minutes
  • Total Time: 30 Minutes
  • Difficulty Level: Easy
  • Recipe Makes 6 Servings

For more inspiration check out our Beef recipe.

🍄 Ingredients for this keto stuffed portobello mushrooms recipe

Here is the list of simple ingredients you'll need to make this dish:

  • 6 portobello mushroom caps
  • 1 tablespoon avocado oil
  • 1 pound of ground beef
  • 2 cups shredded cheddar
  • 4 slices bacon
  • 1 teaspoon of garlic salt
  • ¼ cup of minced onions
  • ¼ cup of diced pickles
  • ¼ cup of diced tomatoes

For the toppings

  • ½ cup shredded lettuce
  • Mustard sauce

Ingredient substitutions

If you don't have all the items mentioned above, use these substitutions instead:

  • Cheddar cheese: If you don't have cheddar cheese, use gouda or Monterey Jack! 
  • Avocado oil: Use olive oil, coconut oil, or ghee as substitutes for avocado oil.
  • Ground beef: If you don't prefer ground beef, you can use ground turkey, ground chicken, ground pork, or ground lamb.
  • Garlic salt: Use a combination of garlic powder and salt to replicate the flavor of garlic salt without the added carbs.
  • Minced onions: Use minced shallots or finely chopped scallions as a substitute for onions.
  • Diced pickles: Dill relish or chopped dill pickles without added sugars can be used as a substitute for diced pickles.

Additional ingredients

You can have fun with more ingredients other than the toppings mentioned above. Even though these ingredients are optional, it doesn't hurt to enhance the flavors of your dish!

  • Avocado: Slice up an avocado and add it on top before serving. You'll love the creamy texture.
  • Jalapenos: Want more spice? Dice up fresh jalapenos and mix them into the beef before stuffing the portobello caps.
  • Cilantro: Sprinkle freshly chopped cilantro before serving for a nice touch of greens.
  • Sour cream: A tablespoon of keto sour cream on top will add a delightful tang.
  • Blue cheese: Mix some blue cheese with the shredded cheddar for a bold flavor.
  • Spinach: Saute some fresh spinach and add it to the filling to make it more delicious.
  • Cream cheese: Add some keto-friendly cream cheese to enhance the flavor profile of the stuffing.
  • Veggies: Chop some fresh bell peppers and cabbage and add them to the caps before baking.

Cooking tools required

To make this Portobello Mushrooms Recipe, you'll need the following tools:

  • 10.5" cast iron skillet
  • Stirring spoon
  • Sharp knife
  • Cutting board
  • Mixing bowl
  • Oven mitts

Tools substitute options

It's okay if you don't have all the tools mentioned above; just use these substitutes instead:

  • Cast iron skillet: Use a large non-stick pan if you don't have a cast iron skillet.
  • Oven mitts: If you don't have oven mitts, use a thick tea towel to handle the hot skillet.

How to make Keto Stuffed Portobello Mushrooms: step-by-step guide

Cooking methods

  • Sautéing
  • Baking

Preparation steps

  1. Gather all your ingredients and measure them.
  2. Prepare your portobello caps by removing the stem and scraping the dark gills away with a spoon.
  3. Shred the cheddar cheese and cut the bacon into thin slices.
  4. Mince the garlic and dice the pickles and tomatoes.

Cooking instructions

Bacon and ground beef mixture

  1. Heat your cast iron skillet over medium-high heat and fry the bacon until crispy.
  2. Once done, remove the bacon from the skillet and set it aside, leaving the bacon grease in the skillet.
  3. Then, chop the bacon into smaller pieces.
  4. Add ground beef to the same skillet and cook it for 7 minutes.
  5. Add the chopped bacon to the skillet and mix it with ground beef.
  6. Transfer the beef-bacon combo into a bowl and set it aside.

Cheese filling

  1. Add shredded cheddar cheese, garlic salt, minced onions, diced pickles, and tomatoes in the same bowl with the beef-bacon mixture.
  2. Mix all the ingredients until well combined.

Assembly and baking

  1. Preheat the oven to 450° F (232° C).
  2. Brush mushrooms with olive oil on both sides.
  3. Fill the oiled portobello mushroom caps with the meat mixture.
  4. Place the mushroom caps in the skillet.
  5. Put the skillet in the preheated oven and bake for about 10 minutes or until the cheese has melted.

Final touch and serving

  1. Remove the skillet from the oven.
  2. Top each stuffed mushroom cap with shredded lettuce.
  3. Drizzle mustard sauce over the top.
  4. Serve the stuffed portobello mushrooms hot, and enjoy!

Note: Make sure to adjust the cooking time and temperature based on your oven's characteristics and the desired doneness of the mushrooms.

Keto Cheeseburger Stuffed Portobello Mushroom Caps arranged in a cast iron skillet

Chef's pro tip

To enhance the sturdiness of the mushroom caps, preheat the oven and bake them for 5 minutes before filling them with the beef stuffing. This simple trick guarantees excellent results every time!

What to serve with these keto mushrooms?

Pair these Keto Stuffed Portobello Mushrooms with these side dishes:

  • Cauliflower Rice: This keto rice pairs perfectly with our stuffed mushrooms.
  • Keto Coleslaw: The crunchy texture of coleslaw complements the rich flavors of our dish.
  • Greek salad: Fresh Greek Salad contrasts nicely with these gourmet mushrooms.

How to make it healthier?

  • Reduce the overall salt content and opt for low-sodium bacon and less salt in the recipe.
  • Choose organic veggies if possible.

Time-saving tips

  • Buy pre-shredded cheese. But watch out for brands that add potato starch to prevent clumping. Those are not keto-friendly.
  • Purchase hollowed-out mushrooms from the store. This will reduce your prep time.

What can I prepare ahead of time?

  • Clean mushroom caps: Clean the portobello mushroom caps and remove their stems in advance. 
  • Pre-cook the bacon: Fry the bacon ahead of time and store it in the fridge.

Storage and reheating instructions

Storage instructions

  • Refrigerator: Once cooled, transfer the leftover mushrooms into an airtight container and store them in the fridge for 3-4 days.

Reheating instructions

  • Oven: Preheat the oven to 350° F (180° C). Then place the leftovers on a baking sheet and heat for 10-15 minutes.
  • Stove: Reheat the leftovers in a skillet over medium heat. Then cover the skillet and heat for 5-7 minutes.

Note: Remove cold toppings like lettuce or mustard before reheating. Add them fresh when serving.

Recipe wrap-up and conclusion

Our Keto Stuffed Portobello Mushrooms are perfect for anyone craving a cheeseburger. This low-carb meal is keto-friendly and satisfies the cravings of a cheeseburger.

This will become your new favorite snack or a quick low-carb dinner option! We can't wait to see how your keto mushroom caps turn out! So share a picture with us, and don't forget to tag us on Facebook and Instagram!

Frequently asked questions

Yes, they are. They have a very low carb content.

Store the stems in the fridge; you can use them for other recipes.

You can use different types of ground meat in this recipe. Use ground chicken or turkey if you don't prefer beef.

Definitely! Mozzarella cheese, blue cheese, Monterey Jack, and parmesan cheese are all excellent options.

Use a homemade keto-friendly mayo, ranch dressing, or spicy buffalo sauce.

Absolutely. Button mushrooms, cremini mushrooms, and shiitake mushrooms are all excellent alternatives.

No, it will negatively impact the texture during the reheating process.

📖 Recipe

Keto Cheeseburger Stuffed Portobello Mushroom Caps in a cast iron skillet

Keto Stuffed Portobello Mushrooms

These Keto Cheeseburger Stuffed Portobello Mushroom Caps are a great low-carb dinner option that the entire family will love!
4.86 from 7 votes
Print Rate Pin Recipe
Course: Appetizer, Main Course, Snack
Keyword: 30-minute, easy, keto, Portobello mushrooms, stuffed mushrooms
Prep Time: 10 minutes
Cook Time: 20 minutes
Total Time: 30 minutes
Servings: 6
Calories: 449kcal

Ingredients

  • 6 portobello caps
  • 1 tablespoon oil of choice
  • 1 pound ground beef
  • 2 cups shredded cheddar
  • 4 slices bacon
  • 1 teaspoon garlic salt
  • ¼ cup minced onion
  • ¼ cup diced pickles
  • ¼ cup diced tomato

Toppings

  • ½ cup shredded lettuce
  • mustard
US Customary - Metric

Instructions

Bacon and ground beef mixture

  • Heat your cast iron skillet over medium-high heat and fry the bacon until crispy.
  • Once done, remove the bacon from the skillet and set it aside, leaving the bacon grease in the skillet.
  • Then, chop the bacon into smaller pieces.
  • Add ground beef to the same skillet and cook it for 7 minutes.
  • Add the chopped bacon to the skillet and mix it with ground beef.
  • Transfer the beef-bacon combo into a bowl and set it aside.

Cheese filling

  • Add shredded cheddar cheese, garlic salt, minced onions, diced pickles, and tomatoes in the same bowl with the beef-bacon mixture.
  • Mix all the ingredients until well combined.

Assembly and baking

  • Preheat the oven to 450° F (232° C).
  • Brush mushrooms with olive oil on both sides.
  • Fill the oiled portobello mushroom caps with the meat mixture.
  • Place the mushroom caps in the skillet.
  • Put the skillet in the preheated oven and bake for about 10 minutes or until the cheese has melted.

Final touch and serving

  • Remove the skillet from the oven.
  • Top each stuffed mushroom cap with shredded lettuce.
  • Drizzle mustard sauce over the top.
  • Serve the stuffed portobello mushrooms hot, and enjoy!

Notes

Make sure to adjust the cooking time and temperature based on your oven's characteristics and the desired doneness of the mushrooms.

Nutrition

Nutrition Facts
Keto Stuffed Portobello Mushrooms
Amount Per Serving
Calories 449 Calories from Fat 324
% Daily Value*
Fat 36g55%
Saturated Fat 16g100%
Cholesterol 103mg34%
Sodium 830mg36%
Potassium 604mg17%
Carbohydrates 5g2%
Fiber 1g4%
Sugar 3g3%
Protein 26g52%
Vitamin A 400IU8%
Vitamin C 1mg1%
Calcium 293mg29%
Iron 2mg11%
*

Nutritional values are estimates only and do not include carbs from sugar alcohols.

# Hashtag with us!Don't forget to mention @castiron_keto or tag #castironketo on Instagram with your creations! We love seeing what you're making.
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Reader Interactions

Comments

  1. Bethany says

    Aaaahhhhhmazing! I followed the recipe exactly, just cut everything in 1/2 cause I only had 3 tops. Sooooo good!

    Reply

  2. Annmarie says

    5 stars
    Super delicious! The whole fam...even the picky 7 yr old loves this dish!!

    Reply

  3. Trisha says

    I plan to make these for dinner. I hope they are half as good as the laugh I had watching Steve Martin saying he would like to buy a hamburger. I have not stopped saying this since I watched it. Thanks for the recipe. I look forward to trying it.

    Reply
4.86 from 7 votes (6 ratings without comment)

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