First prepare the filling. Put the milk in a pot on the fire and when it boils, add the diluted puddings together with the sugar. When the pudding is ready, add the butter and stir until melted. Cover the cooked pudding with fresh food paper and allow to cool completely. When the filling is completely cooled, whisk it with a mixer and add the whipped sour cream or whipped cream. Heat the butter and water in a saucepan on the fire. When the mixture boils, add the flour and mix until you get a cooked dough and it does not form into a ball. Set aside and break the eggs one by one, stirring well between each adding. When you get a puffs dough mixture, transfer it to a cooking syringe and shape it into a pan lined with baking paper. Before baking, sprinkle with powdered sugar on top and bake in a preheated oven at 220 degrees for 5 minutes. Then reduce the temperature to 200 degrees for about 15 minutes, then to 180 degrees for about 5 minutes. Allow to cool completely, cut in half and fill the donuts with the filling. Soak the whole donut in the chocolate glaze previously prepared on steam.