Make the dough. Pour water and milk into a saucepan. Add sugar and salt. Put butter into the saucepan and place the container on medium heat. Wait until the mixture boils and the salt and sugar melt. Reduce the heat and add flour. Stir the contents quickly to obtain a homogeneous mass. Cook, stirring, for 2 minutes. The dough should turn into a lump. Remove the saucepan from the heat and let the dough cool. Add the eggs one by one. After adding each egg, mix the dough thoroughly. It should not be runny, but not tough either.
Form the profiteroles. Transfer the dough into a pastry bag. Put on a star-shaped nozzle. Pipe the profiteroles onto a baking sheet at a distance of 3 cm from each other so that they do not stick together. Put in the oven, bake for 40 minutes. Take the profiteroles out and let them cool.
While the profiteroles are baking, make the cream. Pour the cooled cream into a bowl. Beat it until stiff peaks form with a mixer at medium speed. Gradually add the powdered sugar, continuing to beat. The cream should be fluffy. Carefully transfer it to a clean pastry bag. Make small holes in the profiteroles. Using a thin nozzle, add the cream.