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Mix the dough ingredients together and beat with a dough hook in a stand mixer for 5-10 minutes until you have a soft and slightly tacky dough. Bring together into a ball, grease the bowl and cover, leaving to prove for at least one hour but you can leave it 24 hours in the fridge.
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Preheat oven to 180˚C with either a bakestone or a heavy duty baking tray on the middle shelf to heat up.
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Dust the base of the tart tin with the polenta and flour then when the dough is proved, punch dough and pat out to a round slightly smaller than your tart tin on a lightly floured work surface.
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Transfer to the prepared tin and pat and push the dough up the sides of the tin - I tack it over the rim a little so it doesn't shrink back.
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Spread enough cranberry sauce over the base to create a thin even layer (remember it's quite sweet so you don't want to over do it).
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Scatter over your chopped up leftovers - make sure nothing is bite sized and distribute everything evenly to prevent fights over who got more stuffing later!
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Whisk up the sour cream, eggs, spices and pour over the filling evenly.
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If using a hard cheese, coarsely grate it. If using a softer cheese like Stilton then break off little nuggets and scatter over the surface of the quiche, again, evenly.
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Bake on the preheated bakestone or baking tray for 40 minutes until golden brown and the "pastry" cooked through.
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Allow to cool for at least 15 minutes before serving. See note below about safe storage if not gobbled up immediately!