1In a bowl beat butter ,sugar and orange zest well .
2Add lightly beaten egg and beat well .
3Sift in flour ,salt and baking powder .
4Mix well .
5Add finely chopped blueberries ,orange juice and chocolate chips.
6Mix well using a spatula .
7Cover it with cling film and refrigerate for 20 mins .
8Divide the dough into two parts . Cover one part of the dough with cling film and refrigerate it . This can be used later.
9Line a aluminum tin with parchment sheet . I used a Swiss roll tin . Pre heat the oven at 150 degree C. Shape the dough into 7" long x 2" wide x 1.5 " high log . Egg wash the dough for an even brown colour (optional)
10Place the tin in the middle rack and bake for 12 minutes with top and bottom rods on.Check with a wooden toothpick if it is done .The tooth pick should come out clean .
11Cool it for 15 minutes . When cooled move the log to a cutting board and cut it diagonally in to thick pieces.
12Arrange the biscotti cut side down on a wire rack and bake at 140 degree C for 8 - 10 minutes.
13Now transfer the biscotti to another rack and let it cool.