If the pie crust is frozen, allow it to thaw at room temperature, it will not take too much
Wash and slice the vegetables on a cutting board
Heat a skillet with the olive oil and saute the veggies starting with the leak, then add the bell pepper, then finish with the zucchini
Cook on medium-low heat for about 5-7 minutes, still yet crunchy
In the meantime use a large bowl to grate and mix all the cheeses well
Crack the eggs into the cheeses and mix well for everything to blend properly
As soon as the vegetables are cooked, set them aside and allow to cool for about 10 minutes
Add the sautéed veggies to the cheese mixture and blend everything
Arrange one baking sheet into the string form
Place the pie crust (shortcrust pastry) over the baking sheet into the spring from or other fitting baking dish
Gently pierce the bottom of the dough with a fork
Transfer the veggie-cheese mixture over the pie crust and arrange it evenly using a form or spatula
Fold the edges of the pie crust over the filling, as to "embrace" the filling
Bake in preheated oven for 40 minutes at 360F
As soon as you remove the zucchini pie from the oven, let it rest for about 15 minutes before serving