Craving a juicy burger without the bun? These low-carb portobello mushroom burgers deliver big flavor and satisfying texture. Creamy bacon-herb filling, fresh tomato, red onion, and melted cheese sit between roasted mushroom caps. The result is rich, savory, and completely guilt-free. They come together quickly and make an easy weeknight dinner that feels special.
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Why you’ll love this recipe
These mushroom burgers taste indulgent while staying low-carb and satisfyingly juicy.
- Portobello caps replace bread for a sturdy base
- Creamy bacon filling adds rich savory depth
- Melty cheese and fresh toppings complete every bite
- Ready in about thirty minutes with simple steps
Ingredients
These simple ingredients create juicy low-carb burgers with creamy bacon filling.
- 8 large portobello mushrooms
- 8 oz cream cheese
- 4 slices cooked bacon
- 2 green onions
- 1 tsp garlic powder
- 1 tsp dried herbs
- 1 tomato
- 1 red onion
- 1 cup shredded cheese
- 2 tbsp olive oil
- Salt and pepper to taste
Softened cream cheese mixes more smoothly with the bacon and herbs. Any good melting cheese such as mozzarella or cheddar works well. Pre-cooked bacon saves time; turkey bacon can lighten the dish. Large, firm portobellos hold the filling best and create sturdy “buns.”
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Step-by-step instructions
Follow these steps to build juicy low-carb mushroom burgers packed with creamy filling.
Step 1: Prep the mushrooms
Wipe the portobellos clean and carefully remove the stems. Use a spoon to gently scrape out the dark gills so the caps form neat bowls for the filling.
Step 2: Make the cream cheese mix
In a bowl combine softened cream cheese, crumbled bacon, chopped green onions, garlic powder, dried herbs, salt, and pepper. Stir until everything is evenly mixed and creamy.
Step 3: Fill the bottom caps
Place four mushroom caps gill-side up on a baking sheet. Spoon a generous amount of the cream cheese mixture into each cap and spread it evenly.
Step 4: Add the fresh layers
Top the filled mushrooms with a slice of red onion and a thick slice of tomato. Sprinkle a little shredded cheese over the tomato for extra melt.
Step 5: Cap the burgers
Place the remaining four mushroom caps on top to form the “buns.” Press gently so the layers stay together during baking.
Step 6: Brush and season
Brush the tops of the mushroom caps lightly with olive oil. Sprinkle a pinch of dried herbs and a little salt over the surface for flavor and color.
Step 7: Bake until juicy
Bake the assembled burgers in a preheated oven at 400°F for about 15 to 20 minutes. The mushrooms should soften and the cheese melt fully.
Step 8: Rest and serve
Remove the burgers from the oven and let them rest two minutes. Secure with a toothpick if needed and serve while the filling is still hot and creamy.
Tips & common mistakes
A few simple habits keep the mushrooms firm and the filling from overflowing.
- Choose large, firm portobellos that can hold the filling
- Scrape the gills thoroughly to avoid a muddy texture
- Do not overfill the caps or the mixture will spill out
- Brush oil on the tops so the mushrooms roast evenly
Low Carb Portobello Mushroom Burgers
Equipment
- 1 | Baking sheet |
- 1 | Spoon | for scraping gills and filling
- 1 | Mixing bowl |
- 1 | Pastry brush | for oil
- 1 | Knife |
Ingredients
- 8 | large | portobello mushrooms | stems and gills removed
- 8 | oz | cream cheese | softened
- 4 | slices | cooked bacon | crumbled
- 2 | | green onions | chopped
- 1 | tsp | garlic powder |
- 1 | tsp | dried herbs | plus extra for topping
- 1 | | tomato | sliced
- 1 | | red onion | sliced
- 1 | cup | shredded cheese | mozzarella or cheddar
- 2 | tbsp | olive oil |
- 1 | | salt and pepper | to taste
Instructions
- Preheat oven to 400°F. Clean mushrooms and remove stems and gills.
- Mix cream cheese, crumbled bacon, green onions, garlic powder, herbs, salt, and pepper.
- Spoon the cream cheese mixture into four mushroom caps.
- Top each with red onion slice, tomato slice, and shredded cheese.
- Place remaining mushroom caps on top to form burgers.
- Brush tops with olive oil and sprinkle with dried herbs.
- Bake 15–20 minutes until mushrooms are tender and cheese is melted.
- Rest 2 minutes, secure with a toothpick if needed, and serve hot.
- Tip: Choose large, flat portobellos so the filling stays contained during baking.
Notes
Assembled burgers can be refrigerated up to 24 hours before baking.
Leftovers reheat well in a 350°F oven for 8–10 minutes.
Turkey bacon or cooked sausage can replace regular bacon.
Recipe variations
Easy changes let you customize these low-carb burgers to suit different tastes.
- Add sliced avocado under the tomato for creaminess
- Swap bacon for cooked sausage or chopped jalapeños
- Use goat cheese instead of cream cheese for tang
- Grill the assembled burgers instead of baking them
What to serve with this recipe
Pair these juicy mushroom burgers with light sides that keep the meal low-carb.
- Crisp green salad with vinaigrette
- Roasted broccoli or cauliflower florets
- Zucchini fries or cucumber sticks
- Sparkling water with lemon or iced tea
Pairs well with this: Easy Cheesy Baked Chicken Tortilla Triangles
Frequently asked questions
Quick answers to common questions about these low-carb portobello mushroom burgers.
Can I make these ahead of time?
Yes, assemble the burgers up to a day ahead and keep them covered in the refrigerator. Bake just before serving so the mushrooms stay firm and juicy.
Do I need to remove the gills?
Removing the gills is recommended because they can release dark liquid and give a slightly bitter taste. It also creates more room for the creamy filling.
What cheese works best on top?
Any good melting cheese such as mozzarella, cheddar, or provolone works well. Shredded cheese melts faster and more evenly than thick slices.
Are these truly low-carb?
Yes, using portobello caps instead of bread keeps the carb count low while still delivering a satisfying burger experience with plenty of protein and flavor.
Final thoughts
These low-carb portobello mushroom burgers prove you do not need a bun for a satisfying meal. The creamy bacon-herb filling, fresh vegetables, and melted cheese create rich flavor in every juicy bite. Give them a try for an easy dinner and share your favorite topping combinations or variations in the comments below.