Preheat your oven to 160°C and grease a small rectangular slice pan and line with baking paper.
Place butter, syrup and water in a small saucepan over low heat and cook for 4 - 5 minutes, stirring occasionally. Remove from heat and allow to cool slightly. Stir in bicarbonate of soda and stir to combine.
In a separate bowl, combine the flour, oats, sugar, coconut and white chocolate melts (chopped into smaller pieces). Make a well in the centre and pour in the butter mixture. Mix with a spoon until combined. The white chocolate will melt and combine with the mixture.
Spoon the mixture into the prepared pan and press evenly into a thick, even, slice. Transfer to the oven and bake for 25 - 30 minutes or until golden.
Allow to cool completely in the pan before cutting into pieces. Serve warm or store in the refrigerator for up to 1 week.
Recipe by HIGH WALLS at http://www.highwallsblog.com/2015/01/eat-homemade-anzac-oat-slice/