Mix flour, part of the powdered sugar, butter, and part of the egg by hand. Refrigerate dough for approx. 10 – 15 min.
Preheat the oven to 180°C/350°F. Mix the remaining eggs and powdered sugar, the sweetened condensed milk, and the vanilla extract until smooth.
Roll out dough, and cut circles. Place in a greased muffin tin. Pour the egg filling inside.
Bake for approx. 15 min. at 180°C/350°F.