Beat margarine with sugar and vanilla. Instead of margarine, you can take butter.
In a separate bowl, whisk the eggs.
Pour the eggs in small portions into the margarine and sugar mixture.
Gradually add the flour with baking powder.
Pour in the milk and mix well.
Put 1 tbsp of dough and 1 tsp of condensed milk into the molds.
Put the dough on top of the condensed milk, do not apply the dough to the edges of the mold, otherwise it will melt. Put the dough in a preheated 180 degree oven. And bake until cooked.