Step #1 Preheat oven to 350 F with rack in center.
Step #2 Line a baking sheet with parchment paper or aluminum foil wrap.
Step #3 Set aside.
Step #4 Sift the flour, baking powder & salt into a medium bowl.
Step #5 Set aside.
Step #6 Place the eggs & sugar In a large-ish mixing bowl & beat on high until fluffy & light, about 2 mins.
Step #7 Add the vegetable oil & almond extract, & beat until the oil is incorporated & the mixture is thick & smooth, about 1 min.
Step #8 Reduce mixer to low & beat in the flour mixture.
Step #9 The dough will be quite thick.
Step #10 Knead in the nuts.
Step #11 Turn the dough out onto a lightly floured surface.
Step #12 Flour your fingers & divide the dough in half.
Step #13 Transfer one portion of the dough to one long side of the prepared baking sheet & mold it into a smooth log 14 inches long, 2 1/2 inches wide & 3/4 inch high.
Step #14 Repeat the process with the second piece of dough, & place it 2 inches away from the first log.
Step #15 Bake for 30 mins until light brown & slightly puffed.
Step #16 Remove pan from oven, but do not turn it off.
Step #17 Using a serrated knife, carefully cut the logs in 3/4-inch slices on a slight diagonal.
Step #18 Take care not to tear the parchment or silicone pan liner.
Step #19 Arrange the slices, standing upright, on the baking sheet leaving 1 inch between cookies.
Step #20 Return to the oven & bake 10 mins longer, until the cut surfaces of the cookie have browned slightly & the biscotti are dry to the touch.
Step #21 Transfer to wire rack & cool completely.
Step #22 Melt 8 oz of bittersweet chocolate with 6 tbsps unsalted butter in the microwave.
Step #23 Scrape the chocolate onto a shallow plate & dip one long flat side of each cookie in the chocolate so it comes halfway up the sides.
Step #24 Place each dipped cookie on a wire rack, uncoated side down.