For the dough, mix 250 g flour and 1 teaspoon salt in a bowl. Add 1 egg, 125 g butter in pieces and 1-2 tbsp. cold water. Knead first with the dough hooks of the mixer and then with your hands until smooth.
Grease a tart mould with lifting base (26 cm Ø). Roll out the short pastry on a floured work surface to a circle (approx. 30 cm Ø). Line the mould with the pastry, press the edge slightly. Cut off any excess dough.
Prick the bottom several times with a fork. Chill for about 30 minutes.
Boil 5 eggs hard for about 10 minutes. Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Wash marjoram, shake dry, chop finely. Mix cream cheese, 3 eggs, milk and marjoram well.
Season with salt and pepper. Quench the eggs cold and let them cool down a bit. Cover short pastry with baking paper and legumes. Pre-bake in hot oven for 15-20 minutes.
In the meantime clean, wash and slice the zucchini. Heat the oil in a pan. Fry the zucchini for about 3 minutes. Season with salt and pepper. Peel the boiled eggs and cut them into thick slices.
Wash the tomatoes and cut into small pieces.
Turn down the oven temperature (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Remove the pulses from the tart with the baking paper. Sprinkle the tart with breadcrumbs. Spread zucchini and egg slices on top.
Pour cream cheese mixture over it. Sprinkle with the tomato pieces. Bake in a hot oven for 30-35 minutes.