Preheat oven to 220°C (fan forced 200°C) 420°F/ 390°F. Lightly grease and line 2 baking trays with parchment paper

Combine water and Copha in a medium-sized saucepan; bring to the boil. Reduce heat to low, add flour and stir to combine, stirring continuously for 3 to 5 minutes until mixture leaves sides of the pan and forms a mass

Remove from heat and set aside for 5 minutes. Using an electric mixer add eggs in one at a time, beating well between each addition on medium speed. The mix should be stiff and glossy and hold up on the tip of a spoon

Using a tablespoon, spoon 18 walnut sized balls on the tray spacing 6cm apart. Alternatively, you can also spoon mix into a piping bag fitted with a 1 1/2 cm nozzle and use that for piping pastry onto tray. Bake for 10 minutes, rotate trays, and reduce heat to 200°C/180°C

Continue baking puffs for a further 10 minutes, until brown and springy to the touch. Set aside on the tray for 5 -10 minutes. Then turn onto a wire rack to cool completely

Combine cream, milk, and vanilla bean paste in a saucepan. Bring to boil over medium heat. Remove from stove

Whisk together egg yolks, castor sugar and corn flour together in a bowl. Slowly add cream, whisking continuously until thoroughly combined

Pour mix back into the saucepan and return to a low heat. Stir continuously until the custard thickens and coats the back of the spoon. Remove from heat, set aside to cool. Cover with cling film and put in the fridge until ready to use

To assemble, put vanilla custard in a piping bag fitted with a 5mm nozzle. Make a small hole in the bottom of the cream puff with a sharp knife and pipe vanilla custard in. Melt the milk chocolate and add in pouring cream in batches and mix thoroughly till smooth. Spoon chocolate mix over profiterole. Allow chocolate to set before serving