Preheat oven to gas mark 3, 160°c.
Line a square 25cm baking tin.
Melt butter on the lowest heat in a small saucepan.
Crack the eggs into a mixing bowl with the sugar.
Add the syrup flavour of your choice.
Stir well with a wooden spoon.
Pour in the melted butter and stir for about another minute.
Break the white chocolate into chunks and mix into the mixture.
Spoon the mixture into the tin.
Bake the brownies in the centre of the oven for about 40 minutes.
To test if they are ready, place a cocktail stick into the centre, if it comes out clean they are cooked, if it is sticky, cook for about 5 more min.
Leave to cool and then remove from tin, cut into 16 squares.