Pre-heat oven to 180 degrees C
Mix marinade ingredients in large bowl
Thinly slice mushrooms - there will be different sizes and thicknesses and that is fine - it adds to the end texture
Add mushrooms to marinade and mix until there is a thin layer of marinade coating the mushrooms
Lay out mushrooms on greaseproof papered tray and cook for around 15 minutes, check and turn mushrooms at around 7 mins
When ready the smaller slices will be crispy and the larger slices chewy