Put whole wheat flour, baking powder, quark, oil and milk in a bowl and use the mixer (dough hook) to form a dough. Roll out the dough on a greased baking sheet.
Cut the leek into rings, dice the onions and press the garlic. Fry the chopped vegetables in butter and season with salt and pepper. Now distribute the leek mixture on the dough.
Mix eggs and milk carefully. Pour the egg milk over the leek mixture. Sprinkle everything with cheese. Bake in the oven at 175 ° C for 30 minutes.
If you like, you can add about 75 g of diced ham to the leek mixture.