Preheat oven to 200°C. Line 2 oven trays with baking paper.
Place milk, water, butter, sugar and salt into the Thermomix bowl and cook 10 min/100°C/speed 2.
Add the flour and mix 30 sec/speed 4. Allow to cool for around 30 minutes.
Once cool, add eggs to the mix by dropping one egg at a time onto rotating blades 30-40 sec/speed 4.
Spoon mixture into piping bag with large nozzle and pipe into rounds (or eclairs) on a baking paper lined tray.
Place into oven and cook for approx 20-25 minutes. Depending on what application you are using the choux pastry for, will determine the precise cooking time. See each recipe for further details.