Mozzarella Mushroom Burgers

Ingredients

• As neededCanola oil cooking spray
• 6 (each 7.5–10 cm / 3–4 inches in diameter)Portabella mushroom caps
• 60 ml (1/4 cup)Balsamic vinegar
• 60 ml (1/4 cup)Olive oil
• To tasteKosher salt
• To tasteFreshly ground black pepper
• 6 slicesMozzarella
• 12 slicesCrusty bread
• 1 jar (454 g / 16 oz)Roasted red peppers, drained, dried with kitchen paper and cut into strips

Instructions

1. 1

   Heat the pan

   Coat a grill pan with cooking spray and set it over high heat.

2. 2

   Prepare mushrooms

   Remove the stems. Run a spoon along the underside of each mushroom to scrape out the gills, then wipe the caps clean with kitchen paper.

3. 3

   Mix the dressing

   Whisk the balsamic vinegar, olive oil, salt and pepper together in a small bowl. Brush the mixture over both sides of each mushroom.

4. 4

   Grill and melt

   Once the pan is very hot, add the mushrooms gill side up and baste them with the vinegar and oil mixture. Cook for 8 minutes, turn and cook the other side for 6 minutes. Top each cap with a mozzarella slice and cook for a further 1–2 minutes, until the cheese melts.

5. 5

   Build the burgers

   Set each mushroom cheese side up on a slice of bread. Divide the roasted red pepper strips evenly over the cheese, then top with the remaining bread slices.

6. 6

   Serve with soup

   Serve with Quick Gazpacho.

What are mozzarella mushroom burgers?

A mushroom burger uses a large, cooked mushroom cap in place of a meat patty. This version pairs grilled portabella with mozzarella and roasted peppers, sandwiched between crusty bread.

The idea of a vegetable-based burger has many variations, rather than one single point of origin. Here, a hot grill pan browns the caps while balsamic vinegar brings tang and the cheese helps hold the pepper topping in place.

Nutrition and macros by portion

The nutrition label shows one serving as written: 535 calories, 24g protein, 63g carbs, 21g fat.

The bread contributes most of the carbohydrates, while olive oil and mozzarella provide much of the fat. The mushrooms, mozzarella and bread contribute protein; roasted peppers add some fibre and natural sweetness. Pair a burger with gazpacho or salad for a plate with a fresh vegetable side.

Choosing and preparing the mushrooms

Portabella caps: Choose caps around 7.5–10 cm across so they fit the bread and can hold the toppings. Removing the stems and gills gives the finished burgers a neater, less earthy-tasting centre.

Cleaning: Scrape the gills gently with a spoon, then wipe the caps with kitchen paper. Avoid soaking the mushrooms, as they can absorb water before grilling.

Getting the grill-pan flavour

Hot pan: Let the grill pan become very hot before adding the mushrooms. This gives the caps a chance to sear rather than simply soften in the pan.

Balsamic brush: Coat both sides with the vinegar and oil mixture, then baste again while the mushrooms cook gill side up. Keep some mixture available for this step.

Checking for doneness

Mushroom texture: Follow the stated 8 minutes on the first side and 6 minutes on the second. The caps should soften and take on grill marks; larger or thicker caps may need attention to ensure they are cooked through.

Melted cheese: Add the mozzarella only for the final 1–2 minutes. It is ready when softened and beginning to melt over the cap.

Building a burger that holds together

Dry peppers: Drain and pat the roasted peppers dry before cutting them into strips. This helps keep the bread from becoming soggy.

Layering: Put the mushroom cheese side up on the bread, then spread the peppers evenly over the cheese. Add the second slice just before serving.

What to serve alongside

The recipe suggests serving the burgers with Quick Gazpacho, which makes a cool, fresh contrast to the hot grilled mushrooms. A simple green salad is another straightforward side if you are not serving soup.

Recipe notes & tips

• Use a pastry brush to coat the mushrooms evenly without leaving them swimming in oil.
• Let excess liquid drain from the roasted peppers and pat them thoroughly dry.
• Keep the mushrooms gill side up for the first 8 minutes, as directed.
• Use a wide spatula when turning the caps so they stay intact.
• Add the mozzarella at the end so it melts without overcooking.

Variations

• Add herbs: Brush chopped thyme or oregano onto the mushrooms with the balsamic mixture.
• Use sourdough: Swap in sourdough slices for a tangy, sturdy base.
• Add leafy greens: Tuck a few fresh rocket leaves into each burger just before serving.
• Try provolone: Replace the mozzarella with provolone slices for a different melting cheese.
• Make it spicy: Add a pinch of chilli flakes to the vinegar and oil mixture.

Common mistakes to avoid

• Cool pan: The mushrooms may soften without searing; wait until the grill pan is very hot.
• Wet peppers: Excess moisture can make the bread soggy; drain and pat them dry.
• Rough scraping: Pressing too hard can damage the caps; remove the gills gently with a spoon.
• Early cheese: Adding mozzarella too soon can overcook it; put it on only for the final 1–2 minutes.
• Crowded pan: Caps may not cook evenly if packed tightly; grill in batches if they do not fit in a single layer.

How to store

Store leftover cooked mushrooms and peppers in a sealed container in the fridge for up to 3 days; keep the bread separate. Reheat the mushrooms in a pan until hot, add the mozzarella to melt, and assemble with fresh bread.

Frequently asked questions