Step 1

Place butter in a microwave-safe bowl. Microwave on HIGH (100%) for 30 seconds or until melted. Set aside for 2 to 3 minutes to cool.

Step 2

Stir in vanilla and egg until combined. Stir in flour, sugar, bicarbonate of soda and salt until combined. Add chocolate. Stir to combine.

Step 3

Using 2 level tablespoons at a time, roll mixture into balls. Between the palms of your hands, flatten balls slightly. Line a microwave-safe plate with baking paper. Place about 4 cookies on prepared plate, allowing room for spreading. Microwave on HIGH (100%) for 2 minutes to 2 minutes 30 seconds or until cooked, but soft to touch. Stand for 1 minute. Transfer to a wire rack to cool.

Step 4

Repeat process with remaining cookies in 4 batches. Serve (see note).