If you're wondering how to cook portobello mushrooms in the oven, this simple roasted method is the easiest way to get tender, juicy mushrooms every time. With just a few pantry ingredients and about 20 minutes in the oven, you'll have perfectly roasted portobello mushroom caps that work as a side dish, vegetarian main, or sandwich base.
About the Recipe
The slices of portobello mushroom caps in this recipe are tossed in a delicious blend of olive oil, rosemary, thyme, garlic powder, and onion powder.
They are then roasted until golden brown and irresistibly tender.
Roasting is one of the tastiest ways to prepare mushrooms and I love how quick I can have these ready to go. This recipe is great for cozy family dinners, gatherings with friends or formal holiday meals. They make for a crowd pleasing side dish every time they're served!
I like to serve these baked portobello mushrooms with wild rice and steak, or use these for a creamy mushroom sauce or portobello mushroom pizzas. You can also serve as a side dish for a holiday meal!
If you are looking for more mushroom recipes, check out our: Boursin Stuffed Mushrooms, Easy Sautéed Whole Garlic Mushrooms, Mushroom Alfredo or Sausage and Mushroom Rigatoni with Crispy Sage.
Jump to:
- About the Recipe
- Why You Will Love This Recipe
- How Long to Bake Portobello Mushrooms at 400°F
- Ingredients
- How to Cook Portobello Mushrooms in the Oven
- Ways to Serve Roasted Portobello Mushrooms
- Expert Tips and Tricks
- Kitchen Equipment
- Recipe Substitutions/Variations
- Frequently Asked Questions
- Recipe Storage and Reheating
- Other Recipes to Try
- Roasted Portobello Mushrooms
Why You Will Love This Recipe
- Flavorful - This recipe is bursting with flavor, thanks to the blend of rosemary, thyme, garlic powder, and onion powder which perfectly complements the natural earthiness of the portobello mushrooms. A rich and savory taste in every bite!
- Simple -This recipe is incredibly simple to make. With just a few common ingredients and minimal preparation time, it's perfect for both novice and experienced cooks looking for a quick and delicious dish. If you're a fan of mushrooms, you need to make this dish!
- Versatile - This roasted portobello mushroom dish is highly versatile. It makes an excellent side, a flavorful topping for salads and burgers, or a hearty main course for vegetarian meals. Its flavors complement a wide range of dishes, adding delicious flavor to any meal.
How Long to Bake Portobello Mushrooms at 400°F
Bake at 400°F for 15-20 minutes depending on size.
Ingredients
Here are the simple ingredients you will need for this great side dish:
- Large portobello mushrooms: You will need 4 large portobello mushroom caps.
- Olive oil
- Rosemary - You can use fresh rosemary or dried.
- Thyme - You can use fresh thyme or dried.
- Garlic powder
- Onion powder
- Kosher salt & black pepper
How to Cook Portobello Mushrooms in the Oven
Let's make this portobello mushroom recipe together!
Step 1
Preheat the oven to 400°F and line a baking sheet with parchment paper.
Step 2
Slice the mushroom caps and place them in a large bowl.
Step 3
Add the olive oil, rosemary, thyme, garlic powder, onion powder, salt, and black pepper. Toss well and transfer to the prepared baking sheet.
Step 4
Roast in the preheated oven for 15-20 minutes, turning once, until golden brown.
Ways to Serve Roasted Portobello Mushrooms
- With balsamic glaze
- As a vegetarian burger
- Sliced over pasta
- Stuffed with cheese
- On grain bowls
Expert Tips and Tricks
Here are some expert tips to make this baked portobello mushroom recipe:
- Don't overcrowd - Arrange the mushroom slices in a single layer on the baking sheet to ensure they roast evenly and develop a nice golden brown color.
- Use a lined baking sheet - Line your baking sheet with parchment paper or a silicone baking mat. It prevents the mushrooms from sticking and makes for easier cleanup.
- Turn once - Turn the mushrooms halfway through roasting to ensure they cook evenly on both sides and develop a beautiful, caramelized exterior.
- Check for doneness - Keep an eye on the mushrooms towards the end of the cooking time to avoid overcooking, as they can become too soft and lose their texture.
Kitchen Equipment
Here is some kitchen equipment you will need for this easy recipe. You can find all of these products on Amazon.
- Baking sheet - Use a good quality sheet pan for even cooking!
- Parchment paper - I love these parchment paper sheets for roasting vegetables. They make cleaning up so much easier!
Recipe Substitutions/Variations
Here are some common recipe substitutions and variations for the mushrooms.
- Herbs - If possible, use fresh herbs for a more vibrant and aromatic taste. Try replacing the rosemary and thyme with other herbs like oregano, basil, or parsley for a different flavor profile.
- Additions - Add spices like paprika, cumin, Italian seasoning, chili powder, or red pepper flakes for a spicier kick. Sprinkle grated Parmesan cheese or crumbled feta cheese on the mushrooms during the last few minutes of roasting for a cheesy twist. Add other vegetables like bell peppers, zucchini, or cherry tomatoes to the mix for a more colorful and varied dish.
- Mushrooms - You could also make this with crimini mushrooms, also known as baby bellas. You could also use white button mushrooms in this recipe.
Frequently Asked Questions
Yes, you can certainly use other types of mushrooms for this recipe, although the cooking times and textures may vary slightly depending on the mushroom variety. Some mushrooms that work well for roasting include cremini mushrooms, shiitake mushrooms, or even button mushrooms. Adjust the slicing and cooking time accordingly to achieve the desired texture and flavor.
Yes, you can prepare the mushrooms ahead of time for this recipe. After tossing them in the olive oil and spice mixture, you can cover and refrigerate them for up to a few hours before roasting. This allows the flavors to develop further. I would allow them to come to room temperature before roasting to ensure even cooking.
You'll know the mushrooms are fully cooked when they are golden brown and tender. They should have a slight crispiness on the edges and a juicy, meaty texture. You can test them by poking with a fork; they should be soft and easy to pierce.
Recipe Storage and Reheating
Here are storage instructions for this roasted mushroom recipe.
- Refrigerator Storage: Store leftover mushrooms in an airtight container in the refrigerator for up to 5 days. Reheat in the microwave or in the stove until heated through.
- Freezer Storage: Allow them to cool completely, then transfer them to an airtight container or a freezer safe bag. They can be frozen for up to three months. To reheat, thaw them in the refrigerator overnight and then warm them in the oven until heated through.
Other Recipes to Try
Roasted Portobello Mushrooms
Ingredients
- 4 portobello mushroom caps
- 2 tablespoons olive oil
- 1 teaspoon rosemary
- 1 teaspoon thyme
- 1 teaspoon garlic powder
- 1 teaspoon onion powder
- 1 teaspoon salt
- ½ teaspoon black pepper
Instructions
- Preheat oven to 400F.
- Slice portobello mushroom caps. Place in a large mixing bowl.
- Mix sliced mushrooms, olive oil, rosemary, thyme, garlic powder, onion powder, salt, and black pepper. Transfer to a lined baking sheet.
- Roast for 15 minutes, until golden brown.
Notes
Storage
- Refrigerator Storage: Store leftover mushrooms in an airtight container in the refrigerator for up to 5 days. Reheat in the microwave or in the stove until heated through.
- Freezer Storage: Allow them to cool completely, then transfer them to an airtight container or a freezer safe bag. They can be frozen for up to three months. To reheat, thaw them in the refrigerator overnight and then warm them in the oven until heated through.
Tips and Tricks
- Don't overcrowd - Arrange the mushroom slices in a single layer on the baking sheet to ensure they roast evenly and develop a nice golden brown color.
- Use a lined baking sheet - Line your baking sheet with parchment paper or a silicone baking mat. It prevents the mushrooms from sticking and makes for easier cleanup.
- Turn once - Turn the mushrooms halfway through roasting to ensure they cook evenly on both sides and develop a beautiful, caramelized exterior.
- Check for doneness - Keep an eye on the mushrooms towards the end of the cooking time to avoid overcooking, as they can become too soft and lose their texture.
Did You Make This Recipe?
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