Pre-heat your oven to 180 degrees celsius and line an 18 x 28cm slice tin with baking paper.
Place the butter and caster sugar into your Thermomiw bowl and cook for 4 minutes, 80 degrees, speed 2.
Add the dates which have had the pip removed and mix 2 - 3 times using the 1 sec turbo function until chopped to your liking.
Scrape down the sides of your Thermomix bowl and add the egg, vanilla extract, self raising flour and salt. Mix for 10 seconds, speed 4, REVERSE to combine.
Scrape down the sides of the bowl and mix for a further 5 seconds, speed 4 on REVERSE.
Transfer the mixture to your prepared baking tin and place into your preheated oven to cook for 20 - 25 minutes or until golden on top and cooked through when tested with a skewer.
Carefully remove the baking tin from the oven and allow it to cool for 5 minutes before carefully slicing into fingers while the slice is still hot.
Once the slice has completely cooled, remove from the tin and enjoy.