Mash the potatoes well along with the oil , herbs and salt . Pat the potato ' dough ' onto your flan dish evenly covering the sides and bottom ( 1/2 " thick ) and bake in the preheated oven for 15 minutes . Take out and cool .
In a 1 tablespoon olive oil over very high heat smoke the pepper and immediately add the leek and chopped mushrooms . Don't allow the mushrooms to loose water which is why it is cooked no more than a minute and under very high heat.Remove from heat and cool .
Meanwhile whip the eggs , milk , cheese , baking powder , salt and any leftover mashed potato .
Stir in the cooked leek and potatoes , pour the filling into the potato shell , bake 25 minutes .
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