Preheat oven to 160ºC/325ºF/gas 3.
Sieve flour, bicarbonate of soda and cinnamon into a large bowl. Make a well in the centre, then whisk in the eggs, milk, butter, maple syrup and olive oil until it forms into a smooth batter.
Mash the sweet potato, then fold into the batter.
Pour the mixture into a loaf tin lined with parchment paper.
Bake for about 50 minutes or until a skewer inserted in the loaves comes out clean.
Serve with natural yogurt and chia jam.