- 8 tablespoons unsalted butter, at room temperature
- 3/4 cup sugar
- 1 egg, separated
- 1 teaspoon vanilla
- 2/3 cup sifted flour
- 1/3 cup cocoa
- 1/2 teaspoon cinnamon
Preheat the oven to 400 degrees.
Butter a 14 x 18inch baking sheet with 1 tablespoon of the butter.
Using your fingers, which have been run under cold water and dried, spread the batter over the baking sheet, completely covering it to the edges.
Beat the egg white until stiff and spread it over the batter. Combine the cinnamon with the remaining 1/4 cup sugar, and sprinkle it over the egg white.
Bake for about 10 minutes. Remove from the oven and immediately cut the pastry into about 24 diamond, square, or oblong shapes.