Blend butter (room temp) , eggs, condensed milk and the milk. Mix everything well.

Next,in a large bowl with the baking powder and the flour, add slowly the previous mixture without stop of mix. It is better do this step with the blender, because it is needed a smooth texture.

Pour the mixture in a greased mold,and put it in the oven about 30 minutes in a temp of 200°. Test some times the consistency of the cake, and when the center it's done,the cake too!!