Preheat oven to 200C/400F/gas mark 6. Lightly fry the mushrooms, cap-side down, in hot oil for 20 seconds.

Arrange the mushrooms in a shallow roasting tin with the stalks facing upwards.

Mix together the butter, garlic, thyme, lemon juice and seasoning. Spoon a little garlic butter on to each mushroom, then lightly press the breadcrumbs on top. Either refrigerate for later use, or cook immediately in the oven for 10 minutes.