Preheat your oven to 350 and grease a 9x5 inch loaf pan and line with parchment paper leaving a 2-inch overhang oon either side. Set aside.
Cream butter and sugars with a hand blender or stand mixer. Mix in maple syrup. Add eggs one at a time and blend in between. Mix in mashed sweet potato and orange zest.
In a separate bowl, whisk flour, baking powder, baking soda and salt. Add flour mixture in stages to butter mix incorporated after each addition.
Stir in the chocolate chips. Pour into prepared baking pan; tapping pan down to make sure it's evenly distributed. Sprinkle an extra handful of chocolate chips along the top.
Bake in the oven for 50 to 55 minutes or until a toothpick inserted into the centre comes out clean. Cool on a rack for a few minutes. Turn out of pan and store in a plastic bag for up to a week.