Delicious Portobello Mushroom Keto Burger Recipe (Bun-less) for a Healthy Meal

Discover the Ultimate Keto Delight: Portobello Mushroom Keto Burger (Bun-less)

Imagine biting into a juicy, flavorful burger that fits perfectly into your keto lifestyle. That’s exactly what you get with the Portobello Mushroom Keto Burger (Bun-less). This isn’t just any burger; it’s a culinary masterpiece that combines the rich, earthy tones of Portobello mushrooms with the succulent taste of a well-seasoned beef patty. It’s a bun-less wonder that will satisfy your burger cravings without the carb overload.

Perfect for those on a ketogenic diet, this burger delivers all the traditional flavors you love, minus the carbs. Whether you’re looking to maintain ketosis or simply enjoy a healthier version of a classic, this Portobello Mushroom Keto Burger is a must-try. Packed with high-quality fats and protein, it’s a meal that will keep you full, energized, and on track with your dietary goals.

Portobello Mushroom Keto Burger (Bun-less)

The Story Behind the Portobello Mushroom Keto Burger

As a keto enthusiast, I’m always on the hunt for recipes that not only adhere to the low-carb, high-fat principles but also bring excitement to the dinner table. The Portobello Mushroom Keto Burger is a personal creation born from my love for classic comfort food and my commitment to a ketogenic lifestyle. It’s a burger that doesn’t skimp on flavor or satisfaction, despite being bun-less.

Portobello mushrooms are a keto dieter’s dream. They are low in carbs but high in flavor and versatility. When used as a substitute for traditional buns, they provide the perfect vessel for a juicy beef patty, creating a burger experience that’s both indulgent and diet-friendly. The mushrooms’ meaty texture and ability to absorb flavors make them an ideal choice for a keto burger.

The beef patty is another key component. I opt for 80/20 ground beef, which ensures the burger remains juicy and rich in healthy fats, crucial for maintaining ketosis. The addition of simple seasonings enhances the beef’s natural flavors, making each bite a delectable treat. Topped with a slice of melty cheddar cheese, this burger is a harmonious blend of textures and tastes that will leave you wanting more.

And let’s not forget the toppings. Sliced red onion, crispy lettuce, and fresh tomato add a refreshing crunch, while the trio of mayonnaise, mustard, and unsweetened ketchup introduces a tangy, creamy element that rounds out the burger’s profile. Each ingredient has been carefully selected to ensure it’s not only keto-friendly but also contributes to the overall gastronomic experience.

Ingredients for Portobello Mushroom Keto Burger

Mastering the Bun-less Burger: Tips and Tricks

Creating the perfect Portobello Mushroom Keto Burger is an art that requires a bit of know-how. The first step is to preheat your grill or grilling pan to the right temperature. A medium-high heat is ideal for achieving those beautiful grill marks on your mushrooms and ensuring your beef patties cook evenly.

When preparing the Portobello mushrooms, make sure to brush them with olive oil and season them lightly. This not only prevents sticking but also infuses the mushrooms with flavor. Be mindful of the mushrooms’ cooking time; they should be tender but not overcooked to maintain their structural integrity as the “bun.”

As for the beef patties, mixing in the right amount of seasoning is crucial. Don’t overwork the meat to keep the patties tender. When grilling, resist the urge to press down on the patties, as this can cause them to dry out. Adding the cheese at the right moment is key – you want it to be perfectly melted when you take the patties off the grill.

Resting the grilled items is a step you shouldn’t skip. It allows the juices to redistribute in the beef and the mushrooms to cool slightly, making them easier to handle. When assembling your burger, layer the ingredients thoughtfully to maximize the flavor in every bite. The lettuce acts as a barrier, keeping the mushroom cap from getting soggy, while the condiments on top of the patty ensure you get a bit of everything in each mouthful.

Assembled Portobello Mushroom Keto Burger

Variations to Spice Up Your Keto Burger

Avocado & Bacon Bliss

Add a creamy texture and a smoky crunch to your burger by incorporating avocado and bacon. The avocado provides healthy monounsaturated fats, while the bacon adds a satisfying crunch. Layer slices of avocado and a couple of crispy bacon strips on top of the beef patty before capping it with the second mushroom.

The Spicy Tex-Mex

For those who love a little heat, give your burger a Tex-Mex twist. Add jalapeños, a sprinkle of cumin and chili powder to the beef mixture before grilling. Top with a dollop of guacamole and a sprinkle of shredded pepper jack cheese for a burger that packs a punch.

The Mediterranean

Take your taste buds on a trip to the Mediterranean by adding feta cheese, sun-dried tomatoes, and a spoonful of pesto. These ingredients introduce a tangy and herby flavor profile that beautifully complements the earthiness of the Portobello mushrooms.

Substitutions for Your Keto Burger

While the original recipe is designed to be keto-friendly, you might find yourself in need of substitutions. Whether it’s due to dietary restrictions or personal preference, there are plenty of options to customize your burger without compromising on taste or keto principles.

For the beef patty, you can easily substitute ground turkey or chicken for a leaner option. Keep in mind that you may want to add a bit more seasoning or a keto-friendly binder like almond flour to ensure the patty holds together well and remains flavorful.

If dairy is a concern, swap out the cheddar cheese for a dairy-free cheese alternative. There are many keto-friendly options available that melt beautifully and provide a similar texture and taste to traditional cheese.

And for the condiments, if you’re avoiding nightshades or simply don’t care for tomatoes, consider using sliced cucumber or zucchini for a fresh, crunchy alternative. They offer a similar texture with a mild flavor that won’t overpower the other burger components.

Frequently Asked Questions

Can I cook the Portobello mushrooms and beef patties in the oven?
Yes, you can bake the mushrooms and patties in a preheated oven at 400°F (200°C) for about 15-20 minutes or until they reach your desired level of doneness.

How can I ensure my beef patties stay juicy?
Avoid overworking the meat when forming your patties and don’t press down on them while grilling. Also, make sure to let them rest after cooking to redistribute the juices.

What are some other keto-friendly toppings I can use?
Feel free to experiment with toppings like pickles, olives, sautéed mushrooms, or a fried egg. Just ensure they’re low in carbs to keep the burger keto-friendly.

Can I make this burger ahead of time?
You can prepare the beef patties in advance and refrigerate them. Grill them when you’re ready to eat for the best taste and texture. The Portobello mushrooms are best grilled fresh.

Is there a way to reduce the sodium content in this recipe?
To reduce sodium, use less salt in the beef mixture and opt for low-sodium cheese and condiments. You can also use fresh herbs to enhance the flavor without adding extra salt.

Portobello Mushroom Keto Burger (Bun-less)

Indulge in the hearty flavors of a keto-friendly burger with our Portobello Mushroom Keto Burger recipe. Perfectly seasoned, juicy patties nestled between two savory Portobello mushrooms, delivering a mouthwatering experience with each bite. This bun-less burger offers all the satisfaction without the carbs, making it an ideal choice for your low-carb lifestyle.
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Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Course Dinner, Lunch
Cuisine American, Keto
Servings 2 people
Calories 600 kcal


  • Grill or grilling pan
  • Mixing bowl
  • Brush for oil
  • Grill spatula


  • 4 large Portobello mushrooms, stems removed approx. 6 oz or 170g each
  • 1 pound ground beef, 80/20
  • 1 teaspoon sea salt
  • ½ teaspoon ground black pepper
  • 1 tablespoon olive oil
  • 2 slices cheddar cheese approx. 1 oz or 28g each
  • 1 small red onion, thinly sliced approx. 2 oz or 56g
  • 4 leaves lettuce
  • 1 tomato, sliced approx. 3 oz or 85g
  • 2 tablespoons mayonnaise
  • 1 tablespoon mustard
  • 1 tablespoon unsweetened ketchup
  • 1 teaspoon Worcestershire sauce optional


  • Preheat your grill or grilling pan over medium-high heat.
  • Brush the Portobello mushrooms with olive oil and season with a pinch of salt and pepper. Set aside.
  • In a bowl, mix the ground beef with salt, black pepper, and Worcestershire sauce (if using) until well combined.
  • Divide the beef mixture into two equal portions and form them into patties slightly larger than the mushrooms.
  • Place the mushrooms and beef patties on the grill. Cook the mushrooms for about 4 minutes on each side or until they are tender and the beef patties for about 5 minutes on each side or until they reach your desired level of doneness.
  • In the last minute of cooking, place a slice of cheddar cheese on each patty and let it melt.
  • Remove the mushrooms and patties from the grill and let them rest for a couple of minutes.
  • To assemble the burgers, place one Portobello mushroom cap, gill-side up, on a plate. Add a lettuce leaf, followed by the cheesy beef patty, a slice of tomato, some red onion, and a dollop each of mayonnaise, mustard, and ketchup.
  • Top with the second Portobello cap, gill-side down, and serve immediately.


Feel free to customize your keto burger with additional keto-friendly toppings like avocado, bacon, or a fried egg. For those on a strict keto diet, ensure the ketchup used is unsweetened to keep the sugar content low. Enjoy this fulfilling and delicious burger without any guilt!


Calories: 600kcalCarbohydrates: 12gProtein: 40gFat: 45gFiber: 3gNet Carbs: 9g
Keyword Bun-less Burger, keto burger, Low Carb Burger, Portobello Mushroom Keto Burger
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