Bring the conchiglioni to the boil (but do not cook).
Meanwhile, dice the mozzarella and feta cheese. Mix the ricotta in a bowl, stir in the mozzarella and feta cheese. Stir in chopped parsley and crushed garlic (amount as desired). Season the filling with salt and pepper and pour into the conchiglioni with a spoon.
Put the Conchiglioni in a greased baking dish. Season the chopped tomatoes with Italian herbs, salt and pepper and pour over the filled pasta. Finally sprinkle with parmesan.
Bake in a preheated oven at 200 ° C (convection 180 ° C) for about 30 minutes.