Preheat oven to 350°F. Cover a jelly-roll pan or large cookie sheet with parchment paper, or Silpat silicone baking mat, and set aside.
Place the flour, sugar, baking powder, salt, orange juice, eggs, vanilla and oil into a large bowl and mix until the dough comes together. Add the chocolate chips and mix again. Divide the dough in half and shape each half into a log, about 12 inches long by 5 inches wide. Flatten each loaf slightly. Place the 2 loaves on the prepared jelly roll pan or cookie sheet, about 5 inches apart.
Bake for 30 minutes, until the top feels solid when pressed. Remove from the oven. Slide the parchment paper off the pan. Let cool for 10-15 minutes. Slice the loaves in half the short way. Place one half at a time on a cutting board and slice each loaf into ¾-inch slices.
Place the sliced cookies on the parchment-covered pan. Place the pan into the oven and bake for 4 to 5 minutes more. Let cool on the pan. Store in an airtight container or in the freezer.