Start by making the crust. Mix all the ingredients in a bowl with a wire whisk or a spoon. Use your hands a little too. Once you have made a ball, leave it covered in the bowl for 30 minutes.
Meanwhile chop all your vegetables. Put the onion in a large pan with a little olive oil. After 4-5 minutes add the tomatoes and peppers. Add salt, oregano and a little pepper. Leave them there, stirring occasionally, for about 10 minutes. You want all the liquid to be absorbed. Transfer the vegetables to a plate and allow them to cool sufficiently.
Cut the dough in 2. The one piece that will go under should be larger and the top smaller.
On a clean surface roll out the bottom crust with a rolling pin. Spread it on a pan.
Lift the dough up the sides a little with your hands.
Wipe your vegetables with a piece of kitchen paper so that they are as dry as possible. In a bowl, mix your vegetables with the feta cheese and parsley.
Pour the mixture onto the bottom crust of your pie. Open with the rolling pin and the second crust and spread it on top carefully. Close the pie by bringing the bottom dough side up. Make a few slits with a knife and put in a preheated oven for 60 minutes at 180C.
Let your pie cool for 30 minutes before slicing.