Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large bowl, cream together the butter and sugar until light and fluffy. Add the eggs, one at a time, and mix until well combined. Stir in the vanilla extract.
In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until a dough forms. Stir in the chocolate chips.
Divide the dough in half and shape each half into a log about 12 inches long and 2 inches wide. Place the logs onto the prepared baking sheet.
Bake in the preheated oven for 25-30 minutes or until the logs are golden brown. Remove from the oven and let cool for 10 minutes.
Reduce the oven temperature to 325°F (160°C). Using a sharp knife, slice the logs diagonally into 1/2-inch wide biscotti. Lay the slices cut-side down on the baking sheet.
Return the biscotti to the oven and bake for an additional 10-15 minutes on each side, or until dry and lightly browned. Let cool completely on wire racks.
Notes
Store biscotti in an airtight container at room temperature for up to two weeks.