Preheat oven to 150C.
Melt butter and brown sugar in a pan until sugar is dissolved.
Sift flour into a separate bowl.
Cool slightly and mix through flour, vanilla, dates, nuts then egg.
Mix until combined.
Pour into a lined or greased slice tin and bake for 20 minutes at 150C.
Remove slice from tin and let it cool on a wire rack.
Cut into slices and store in an air-tight container.
