I'm addicted to markets, where I find seasonal vegetables, buy a bit of this, a bit of that and then cook from what I have. Autumn is the season for Porcini mushrooms and squash so I made this gratin with potatoes, layering the vegetables like a lasagna. The recipe looks very long but it's very easy to do. You only have to cook all the ingredients first and then layer them with the bechamel sauce and cook the gratin in the oven. You can do-ahead the vegetables and the bechamel and layer and cook the gratin when you are ready to serve.

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