Berry Quark Vatrushki

For the base, combine quark, whole eggs and egg whites, flour, salt, vanilla, and baking powder, then knead into a dough.

For the filling, mix together soft quark, powdered sugar, and egg yolks.

With damp hands, shape the dough into balls, make an indentation in the center, and fill it with the soft quark mixture. Top with cherries or other berries. If using frozen cherries, thaw them beforehand and drain excess liquid.