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Preheat the oven to 400F
Unfold the puff pastry sheet onto a piece of parchment paper cut to fit a baking sheet. Lightly dust with flour and roll out just a little bit longer and wider, to about 10x13, more or less.
With the tip of a sharp knife score around the edge of the sheet, about 1/2 in from the edge, to form a frame.
Spread or crumble the Boursin cheese evenly across the pastry, leaving the edge free.
Top the cheese with the slices mushrooms, overlapping them to cover the whole surface.
Sprinkle with salt and pepper, and brush lightly with olive oil.
Bake for about 30 minutes, or until the tart is crisp and golden.