Roasted Flat Mushrooms with Green Onion, Thyme & Herb Butter Recipe
Delicious roasted flat mushrooms generously coated with a flavorful herb and green onion butter, baked to tender perfection. This easy-to-make dish is enhanced with fresh thyme and scallions, making it a perfect savory side or appetizer.
- Prep Time: 10 minutes
- Cook Time: 25 minutes
- Total Time: 35 minutes
- Yield: Serves 4
- Category: Side Dish
- Method: Baking
- Cuisine: American
- Diet: Vegetarian
Ingredients
Scale
Mushrooms
- 8 large flat mushrooms (portobello, about 10–12 cm / 4–4.5 inches wide, stem tips trimmed)
Herb & Green Onion Butter
- 100g (7 tbsp) unsalted butter, softened
- 1 cup green onion (scallions), thinly sliced
- 1/3 cup parsley, finely chopped
- 1 tbsp fresh thyme leaves (or 1 tsp dried thyme)
- 1/2 tsp salt
- 1/4 tsp black pepper
For Garnish
- 3 tbsp chopped scallions
- 1 dozen thyme stalks
Instructions
- Clean mushrooms: Trim stem tips of the flat mushrooms and wipe them clean gently with a damp cloth or paper towel to remove any dirt without soaking them.
- Preheat oven: Set your oven to 200°C (390°F) or 180°C fan-forced to prepare for roasting the mushrooms.
- Mix butter: In a medium bowl, combine the softened unsalted butter with thinly sliced green onions, chopped parsley, fresh thyme leaves, salt, and black pepper. Stir thoroughly until the herb butter is evenly mixed.
- Smear mushrooms: Arrange the mushrooms on a large baking tray with the gills facing upward. Spread the herb and green onion butter evenly over each mushroom’s surface, ensuring good coverage. Cover the tray with aluminum foil to help preserve the bright green color of the herbs during roasting.
- Bake mushrooms: Place the covered tray in the preheated oven and roast for approximately 25 minutes, or until the mushrooms become tender and juicy.
- Serve: Transfer the mushrooms onto a serving platter, including all the melted butter and juices from the baking tray. Garnish by scattering extra chopped scallions and fresh thyme stalks over the mushrooms for a fresh, aromatic finish, then serve immediately.
Notes
- Note 1: When cleaning mushrooms, avoid rinsing them under water as they can absorb moisture; instead, use a soft brush or damp cloth.
- Using fresh thyme enhances aroma, but dried thyme can be substituted if fresh is unavailable.
- Covering the mushrooms with foil while baking helps maintain herb color and moisture.
- Serve warm as a side dish or appetizer to complement grilled or roasted meats.
Keywords: roasted mushrooms, portobello mushrooms, herb butter, green onion, thyme, vegetarian side dish, baked mushrooms
