Preheat the oven to 180C/350F and lightly greaseproof a loaf tin.
Place the sweet potato puree, sugars and oil into a bowl and beat until smooth and combined.
Add in the egg and beat until smooth and combined, approximately 1 minute.
Pour in the milk, vanilla extract and whisk to combine until smooth.
In a separate bowl, place the flour, baking powder soda, ground spices and salt.
Toss the flour mixture into your wet mixture and beat on low speed until combined and no dry portions remain on sides of the bowl.
Pour batter into your loaf tin and smooth out the top.
Place in the oven to bake for 40 minutes or until golden all over.
Remove and allow to cool before inverting onto a wire rack until completely cool to the touch.