Combine water and butter in a microwave-safe container.

Microwave for approximately 2 minutes until butter is melted.

Add flour to the melted butter mixture.

Mix with a spoon until well combined.

Microwave for another 30 seconds, stirring again to remove lumps.

Gradually incorporate the beaten egg into the mixture, stirring until smooth.

Preheat oven to 200°C (392°F).

Line a baking tray with parchment paper.

Drop batter onto the prepared baking tray, shaping into long, narrow tubes.

Wet fingers with water to make shaping easier.

Bake in the preheated oven for 25-30 minutes, until golden brown.

Turn off the oven and leave eclairs inside for 10 minutes to cool slightly.

Remove from oven and slice each eclair in half lengthwise.

Fill each eclair with whipped cream and desired toppings (e.g., fruit).

Cover with the top half of the eclair.

Drizzle melted chocolate over the top.

Serve immediately.