For whole wheat muffins in filo pastry, preheat oven to 180 degrees (convection oven 160 degrees). Beat butter, sugar and vanilla pulp with the whisk of a mixer until fluffy. Stir in the eggs.
Gradually stir in the flour, salt and baking powder. Add the milk a little at a time to make the batter nice and fluffy. Brush the muffin tins with oil.
Cut the filo pastry sheets into quarters. Brush the top of one quarter with oil, place another pastry sheet on top. Press the dough sheets into the molds. Pour the batter into the filo nests.
Bake the muffins for about 20 minutes.