To make choux puffs: Preheat oven to 400° (205°C). In a covered saucepan, bring butter, water, sugar, and salt to a boil without lifting cover. Remove pan from heat. .
Stir flour into same saucepan until well incorporated. Put saucepan back on medium-high heat and stir until dough pulls away from sides and becomes a ball. Transfer to a bowl and put aside to cool down a bit.
Add the eggs to the flour one at a time, mixing vigorously with a wooden spoon. Once one egg if fully incorporated, add the next. With an ice cream scoop, create 8 mounds of the mix onto a greased baking sheet. Round-off any rough edges with wet fingers.
Bake mounds for 10 minutes and then lower the heat to 350° (175°C) and cook 40-45 minutes longer. They should be lightly browned, puffed, and cracked. Place then on a cooling rack to cool.
To serve: microwave a bowl with cream for 1 minute. Remove and stir in chocolate chips. Stir until melted and melded.
Slice pastry puffs in half across the middle. On a plate or bowl, top bottom half with a scoop of ice cream, put top half over ice cream. Pour chocolate sauce over and serve immediately. For a bit more dramatic flair, pour chocolate sauce at the table, asking diners to say "when" to stop.