Preheat oven (electric cooker: 180 °C/circulating air: 160 °C/gas: see manufacturer). Brush a tart mould (26 cm Ø) with lift-off base with oil. For the dough mix 125 g flour, baking powder, 1⁄2 TL salt and some pepper in a mixing bowl. Puree 1 egg, 150 g cream cheese and 2 tbsp. oil with a hand blender. Add to the flour mixture and knead to a smooth dough. Roll out round (approx. 28 cm Ø) on some flour. Line the mould with the dough, pressing down the edges. Prick the base more often with a fork and bake blind, but cover with baking paper, sprinkle with dried peas and pre-bake in a hot oven for about 15 minutes.
For the topping, wash and halve the tomatoes in the meantime. Pluck the mozzarella into small pieces. Peel garlic and chop finely. Puree 120 g cream cheese, 1 egg, garlic, 1 teaspoon oregano, some salt and pepper with a hand blender.
Take the tart out of the oven, remove peas and baking paper. Increase the oven temperature (electric cooker: 220 °C/circulating air: 200 °C/gas: see manufacturer). Pour the cream cheese mixture onto the tart base. Spread tomatoes and mozzarella on top. Bake for another 20 minutes.