Soften the butter to the consistency of mayonnaise. Add sugar and mix well with a whisk, then add the egg yolk and combine until even.
Sift the matcha and flour together. Cut the flour mixture into the butter-sugar mix with a spatula. Once the dough comes together, press down on it hard with the spatula until it forms a ball.
Transfer the dough onto a sheet of plastic wrap. Form the dough into a rectangular stick that's about 17 cm long. Cover with the plastic wrap and refrigerate for 1 to 2 hours.
Mark the stick of dough in 1 cm increments using a ruler. Cut through the markings with a knife. Lay the cookies on a baking sheet, and bake in a preheated 300°F/150°C oven for 22 minutes. Let the cookies cool.
Chop the white and milk chocolate and melt them separately over hot water. Transfer 2 teaspoons of the milk chocolate and the white chocolate to icing bags.
Dip each cookie in the milk chocolate.
While the chocolate is still soft, make the fringe using the tip of a toothpick. This is easier if you hold the cookie with one hand. Place the chocolate-iced cookies on a sheet of kitchen parchment paper.
Cut off the ends of the icing tubes with the chocolate in them. Draw the scar and the forehead crease with milk chocolate, and the whites of the eyes with white chocolate.
Put a little chocolate on the nose area to act as glue, and place an M&M on top. Make the eyeballs and mouth with the milk chocolate, and the cookie is done.
Try making different facial expressions!
Story Behind this Recipe
I thought up a fun cookie to serve for Halloween. I wanted them to look like the monster from Frankenstein! The cookie dough is a favorite that I adapted from a recipe I saw on TV many years ago.
These cookies have the distinct flavor of matcha. Adjust the amount of matcha tea powder to taste, but make sure that the total amount of cake flour and tea powder comes to 200 grams.