Line a cookie sheet with a silphat mat or parchment paper.
In a bowl whisk the egg whites until foamy
Add in sugar and then cocoa powder, oil and vanilla until smooth.
Add in salt and baking powder.
Add the flour and stir until smooth.
Pour batter onto lined cookie sheet and spread as thinly as possible with back of spoon.
Sprinkle with chocolate chips and then sprinkle with toffee bits.
Bake in a 325 oven for 20 minutes.
Remove from oven and use a pizza cutter to cut into "shrad" shaped pieces.
Return to oven for 5 more minutes.
Remove form oven and cool. Break into pieces.
If any of the pieces are too thick and chewy you can return them to the oven at 250 degrees for 20 more minutes and then re-cool.
Video
Notes
Spread the batter as thin as you can on a cookie covered with a silphat or parchment paper.
Use a pizza cutter for easy cutting.
Be sure to cut it into pieces while it is still warm.
Don't worry if it doesn't look crisp when you take it out of the oven, it will crisp up as it cools. If any of the pieces are too thick and chewy you can return them to the oven at 250 degrees for 20 more minutes and then re-cool.
Leave it plain or top it with chocolate chips, chopped nuts or toffee bits.