Rainbow cookie pie - Penguin Books Australia

Ingredients

• 190g (1 stick plus 4 tbsp) unsalted butter
• 150g (¾ cup packed) light soft brown sugar
• 150g (⅔, cup) caster sugar
• 1 egg plus 1 egg yolk
• 300g (2½ cups) plain flour
• 1 tsp baking powder
• 40g (2 tbsp) golden syrup
• 60g (2¼oz) bake-stable sprinkles, plus extra for topping
• 60g (2¼oz) M&Ms, plus extra for topping
• 150g (5½oz) white chocolate chips