Preheat the oven to 400 degrees. Lightly fry the mushrooms, cap side down, in hot oil for 20 seconds. Arrange 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 onto each mushroom, then lightly press the breadcrumbs on top. Either refrigerate for later use, or cook immediately in the oven for 10 minutes.
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