In a mixing bowl, vigorously whisk the egg whites until frothy, about 1 minute. Whisk in the sugar until completely incorporated. Add the oil, water, and vanilla extract and whisk until completely combined. Dump in the flour, cocoa powder, baking soda, and salt and whisk until you have a totally smooth and shiny brownie batter. Scrape onto the lined pan and use an offset spatula (or silicone spatula) to spread the batter as thinly and evenly as possible. It should come very close to the edges of the parchment leaving perhaps a 1/2-inch border all around if you have it as thin as you should. Sprinkle the toffee bits and chocolate chips evenly over the surface of the batter. You do not need to press them in for them to stick.