5.0 from 24 votes
Roasted Flat Mushrooms with Green Onion, Thyme & Butter
This can be made with any large mushrooms. Roasting them underside-up allows the herb and green onion butter to seep deep in between the mushrooms gills.Covering with foil helps the mushrooms stay nice and moist, while helping the herbs and green onions retain their vibrant emerald colour. It looks so fresh and stunning against the deep brown of the mushroom gills!Simple, easy and exceptionally delicious. Serve as a vegetarian main for 3 - 4 people, starter or side for 6 to 8, or as part of a meatless meal spread.
Prep Time
10 mins
Cook Time
10 mins
Servings: 4 - 8
Calories: 230 kcal
Course:
Side Dish
Cuisine:
American
Ingredients
- 8 large mushrooms (flat, portobello, "BBQ"), around 10 - 12cm / 4 - 4.5" wide, stem tips trimmed (Note 1)
Herb & Green Onion Butter:
- 100g / 7 tbsp unsalted butter , softened
- 1 cup green onion (US:scallions), thinly sliced
- 1/3 cup parsley , finely chopped
- 1 tbsp fresh thyme leaves (sub 1 tsp dried)
- 1/2 tsp salt
- 1/4 tsp black pepper
Garnishes (optional):
- 3 tbsp chopped scallions
- 1 dozen thyme stalks
Instructions
- Clean mushrooms: See Note 1.
- Preheat oven to 200°C / 390°F (180°C fan).
- Mix butter: Mix the Herb & Green Onion Butter ingredients together in a medium bowl.
- Smear mushrooms: Place mushrooms gills side up on a large tray. Smear the butter mix over the mushroom surfaces. Cover with foil (preserves green colour of herbs).
- Bake: Bake 25 minutes, until mushrooms are tender.
- Serve! Arrange on a platter, including all butter and juices on tray. Scatter with thyme stalks and extra scallions over the mushrooms (for a fresh touch), and serve.
Cup of Yum
Notes
- Mushrooms - Use any type of large mushrooms. If they are much smaller than specified, use more. The idea here is just to use large mushrooms big enough to hold the butter!
- How to clean mushrooms - Clean mushrooms by removing dirt using a cloth or paper towel. If you're going all out or need to get into the cracks and crevices, use a pastry brush! Though these days, grocery store mushrooms are sold pretty clean.
- It's best not to wash with water because mushrooms are extremely porous and so if they absorb water, it can make them slimy or mushy.
- Should I remove mushroom gills? Mushroom gills are totally edible and I never remove them, unless I'm making specific types of stuffed mushrooms where I want to make room for more filling. Some people say they don't like the flavour of the gills (eg dusty flavour), I've never experienced that.
- However, if you don't like the gills, just remove them using a spoon. Cradle mushroom in one hand, gently work the tip of a spoon under the gills and scoop around - it will come off with little effort.
- The stem - If your mushroom has a very long stem, trim it so it's the height of the edge of the mushroom, or snap it off (with fresh mushrooms, the stem will break off neatly).
- How to store mushrooms - Always store mushrooms in a breathable bag, such as a brown paper bag or wrapped in a tea towel. If you use plastic bags or containers, the mushrooms will sweat, the surface will go slimy and the shelf life of the mushrooms will be considerably shorter.
Nutrition Information
Calories
230cal
(12%)
Carbohydrates
10g
(3%)
Protein
5g
(10%)
Fat
21g
(32%)
Saturated Fat
13g
(65%)
Polyunsaturated Fat
1g
Monounsaturated Fat
5g
Trans Fat
1g
Cholesterol
54mg
(18%)
Sodium
462mg
(19%)
Potassium
741mg
(21%)
Fiber
3g
(12%)
Sugar
5g
(10%)
Vitamin A
1436IU
(29%)
Vitamin C
15mg
(17%)
Calcium
48mg
(5%)
Iron
2mg
(11%)
Nutrition Facts
Serving: 4- 8
Amount Per Serving
Calories 230
% Daily Value*
| Calories | 230cal | 12% |
| Carbohydrates | 10g | 3% |
| Protein | 5g | 10% |
| Fat | 21g | 32% |
| Saturated Fat | 13g | 65% |
| Polyunsaturated Fat | 1g | 6% |
| Monounsaturated Fat | 5g | 25% |
| Trans Fat | 1g | 50% |
| Cholesterol | 54mg | 18% |
| Sodium | 462mg | 19% |
| Potassium | 741mg | 16% |
| Fiber | 3g | 12% |
| Sugar | 5g | 10% |
| Vitamin A | 1436IU | 29% |
| Vitamin C | 15mg | 17% |
| Calcium | 48mg | 5% |
| Iron | 2mg | 11% |
* Percent Daily Values are based on a 2,000 calorie diet.