Roasted herby mushrooms - BBC Good Food

Almost directly quoting:

• Heat oven to 200C/180C fan
• Arrange the mushrooms in a roasting tray in a single layer, then cook for 15 mins.
• Meanwhile, mix the garlic, rosemary, olive oil and vinegar with some seasoning.
• Remove mushrooms and pour away any liquid, then toss in the oil and herb mix.
• Return to the oven for 10-15 mins more until tender.