Preheat your oven to 325 degrees F on convection bake.
In a mixing bowl, whisk the egg, sugar, and vanilla on medium-low speed until pale and frothy. Mix in the mazola oil, olive oil, lemon juice and lemon zest.
1 egg, 1/2 cup white granulated sugar, 1 tablespoon pure vanilla extract, 1/4 cup mazola oil, 1/4 cup extra virgin olive oil, 1/3 cup fresh lemon juice, 1 tablespoon lemon zest
In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add the flour mixture to the wet ingredients until fully absorbed. Then fold in the chocolate chips. The dough will be sticky but pliable. Allow the dough to rest uncovered at room temperature for 10-15 minutes.
2 1/4 cups all-purpose flour, 1 1/2 teaspoons baking powder, Pinch of salt, 1/2 cup white chocolate chips
Clean a flat surface like your kitchen counter or dining table. Lightly oil your hands and roll the dough into a ball. Next, roll the dough and press your hands lightly outwards to form a long dough log. Use a sharp knife to cut the biscotti log into two equal pieces.
Roll each piece into a ball, and then following the same technique as above, press your hands lightly outwards to create a log. Next, shape the biscotti dough into a 3-inch-wide, 1-inch-high loaf. Score into ½"-¾" slices with a butter knife (don't cut all the way through).
First bake. Place the loaves on a baking sheet and bake for 25 minutes, until lightly golden. Remove the biscotti loaves from the oven and wait a few minutes for them to cool. Then, carefully transfer the warm biscotti loaves to a cooling rack. Allow the loaves to cool for about 15-20 minutes. Next, use a sharp serrated knife and a cutting board to cut the cooled biscotti loaves along the score lines.
Second bake. Transfer the cut biscotti to the cookie sheet in a single layer and place them in the oven. Bake the biscotti for about 20 minutes at 250 degrees F on convection bake (or longer if you prefer crispier biscotti).