Recipe posted on café, copied here so it won't get lost
A great big flat mushroom each, put into an oiled dish; finely chop any stalk, sauté; this time I added finely chopped aubergine as not much stalk, garlic, then add handfuls of baby spinach (at least 1 handful per person); wilt, season, add finely grated parmesan (about a tablespoonful between 2).
Pile this into mushrooms, dollop a bit of creme fraiche on top and a bit more parmesan.
Cover loosely with foil; bake at about 180-190c for 10 mins, then remove foil for about another 10 mins.
It gets gorgeous juice in the dish, so you can add a little water to it before spooning it on top.
Served with chunky oven chips, roast cherry tomatoes and a pile of salad.
It's very nearly as good as a really good steak
Also good with eg dolcelatte instead of, or as well as, the parmesan.