Preheat the oven to 375°F.
Prepare a baking sheet with parchment paper and set aside.
In a small bowl, mix up the powdered egg substitute to the package directions and set aside to thicken.
Whisk together in a large mixing bowl, oil, almond and vanilla extract, water, both sugars until well blended.
Pour in the egg substitute and blend until well combined, set aside.
Combine flour and baking powder into a separate medium mixing bowl.
Next gradually add the flour mixture to the wet ingredients.
Stir until everything is well combined.
Sprinkle additional flour onto the parchment lined baking sheet.
Place the dough onto the floured baking sheet and shape it into a log.
Press the log down to about 2 inches wide.
Place the baking sheet into the oven and bake about 15 minutes, until the log is firm and has a slight brown color.
Remove the log from the oven and leave it cool to room temperature.
Cool the oven down to 325°F, you can shut off the oven while the log cools.
After the log has cooled, cut the log into 3/4 inch thick slices.
Place the slices back onto the baking sheet.
Return the cookies to the oven and bake for 8 minutes, flip the biscotti, bake for another 4 to 7 minutes, until the biscotti is crisp.
Remove from the oven and place on cooling rack to cool.
After the biscotti has cooled, serve plain or spread with a chocolate frosting.