My mums cream puffs recipe

I brought a treat for Charlotte because she is leaving and going to Auckland.Here is my mum's recipe. Paige

CREAM PUFFS
100 g butter 
 3 eggs
1 cup water     
1 cup of plain flour
 chocolate icing
whipped cream

Combine butter and water in a  aucepan .
Bring to a rolling boil .
Remove from heat and quickly add flour .
Beat with a wooden spoon until mixture leaves the sides of the saucepan .
Allow to cool for 5 minutes .
Add eggs one at a time beating well after each addition until mixture is glossy .
Pipe the mixture onto greased oven trays
Bake at 200 degrees Celsius for 30 minutes or until they are puffy and golden then lower heat to 120 degrees Celsius and continue baking for about 15 minutes until dry. Cool thoroughly .Using a sharp knife cut slits into the sides of each cream puff .
Fill with whipped cream and ice tops with chocolate icing

Makes 30