Combine flour together with sugar.
Rub the butter and margarine into the flour mixture, until it looks like fine bread crumbs.
Make a well in the middle of flour, place mayonnaise, eggs and baking powder. Combine it using a mixer or by hand.
Using an Orshnitsa maker, place small pieces of dough inside each metal form. Press the mold to close together, cook until each cookie is golden brown.
Break out the sides of each cookie.
Turn those broken off sides of the cookies, into crumbs.
For the filling, beat butter together with dulce de leche. Add crumbs into the cream and stir to combine.
Fill each side with the filling mixture and join the two cookies together to form a whole.