Preheat oven to 325F (not fan-assisted), with rack in center of oven.
Grease an 8 1/2 x 4-inch loaf pan and line with parchment paper, covering the bottom and long sides of the pan, overhanging the side edges by about an inch. Set aside.
In a medium bowl, whisk together the flour, baking powder and salt. Set aside.
Melt butter and set aside to cool until needed.
Set aside a hearty pinch of the orange zest (for garnishing) and finely mince the rest of the zest.
Add room temperature eggs and sugar to a large bowl and beat together well until light and fluffy, about 2 minutes. Add orange zest and mix in briefly. Add cream and extract and beat the mixture well, another 1-2 minutes.
With mixer on low speed, spoon in the flour mixture, mixing until well combined.
Add the melted (but cooled) butter and mix in until well combined.
Fold in the chocolate chips and pour batter into prepared loaf pan and smooth top.
Sprinkle the reserved orange zest and a handful of chips on top of the batter.
Set in oven for 30 minutes, rotate and bake for at least an additional 30 minutes. Bake until a skewer comes out clean. (In my natural gas oven this took 70 minutes.)
Let cool completely.