Preheat oven to 350 degrees F.

Line 2 sheet pans with silicone sheet or parchment paper 

In a bowl, place the flour and confectioners sugar. Mix until combined

Slowly add the egg whites, vanilla, and butter and mix with a whisk 

The batter should be thick, like a pancake batter 

In a smaller bowl, place the cocoa powder. Add about 2-3 tablespoons of the batter and mix until evenly combined.

Place the chocolate batter in a piping bag fitted with a small round tip and set aside

Spoon 1 1/2 teaspoons separated mounds of the white batter on the sheet pan. I was able to fit 4 or 5 in mine

White a small spatula or your index finger spread the batter thinly in a circular motion. Pipe the chocolate batter on top, use any design you may like: stripes, zigzag, squiggly lines, etc 

Bake for 5-9 minutes (depending on your oven and the thickness you made the circles) until the outer edges of the tuiles start to turn brown

Remove them quickly from the oven and flip them over. Using the handle of a wooden spoon, roll them into a cigar, slide the cigar off and continue with the other ones. They will harden as they cool. 

Let the tuiles completely cool on a cookie sheet and serve with your favorite ice cream

Store in a tight proof container at room temperature 

Enjoy with ice cream