Preheat the oven to 175 °C
Mince the onion, slice the zucchini into rings and dice the red pepper.
Heat oil in a frying pan.
Fry the onion, then after a few minutes add the courgette and pepper.
Season with salt, pepper and thyme. Press the garlic cloves over the vegetables. Mix and fry for 5 minutes.
Remove from the heat.
Cut the feta cheese into small cubes and add to the vegetables.
Roll out the dough and form a circle about 25 cm in diameter.
Oil a pie dish. Place the vegetables at the bottom of the pie dish.
Cover with the dough.
Bake for 35-45 minutes.
Once the tart is cooked, remove the edges of the tart from the tin.
Place a plate on the tart and turn the tart over.