Grease a slice tin (approx 26 x 16 cm) and line with baking paper, leaving excess on the sides to lift out slice once cooked.
Add the melted butter and brown sugar to a mixing bowl and stir until combined.
Add the egg and vanilla extract and stir until combined.
Add sifted flour and salt and stir until just combined.
Add chopped walnuts and chopped dates and fold into the mixture until they are evenly distributed throughout the mixture.
Pour mixture into prepared slice tin and spread out evenly into the tin using the back of a metal spoon.
Bake for 30-35 minutes or until a deep golden colour.
Allow to cool in tray and then remove the slice from the tin using the overhanging baking paper and cut into squares.
Notes
Storing: Your slice should last up to 7 days stored in an airtight container in a cool, dry place. Freezing: Freeze, wrapped well and placed into an airtight container, for up to 2 months. Nutrition: The nutrition information is an automatically generated estimate and is not guaranteed to be accurate.