Line an average size slice tin with baking paper. Preheat oven to 180°C. Combine dry ingredients then stir in melted butter, pressing the butter into the mixture to combine everything. When all butter is evenly absorbed, press mixture into slice tin and bake for 20 minutes or until golden brown. Serve in small squares - about 3cm x3cm. Take some time to enjoy with a cup of tea or coffee. Make sure there is some left for the next day!