Frankenstein Shortbread Cookies

• Use an electric mixer to combine 1 cup of butter, 2 cups of flour, 1/2 cup of powdered sugar, 2 Tbsp matcha powder, and 1/2 tsp of fine salt. The mixture might look a bit crumbly at first, but it will eventually form a soft dough once it's fully mixed. If the dough still won’t come together, microwave the bowl for 2–3 seconds at a time, just until the butter softens slightly. Don’t let it melt!
• The color of the dough from the matcha powder will be a pretty muted green. If you want the dough to be a brighter green, mix in a squirt of green gel food coloring.
• Scoop the dough into a large piece of plastic wrap and flatten it out into a rectangle that's about 1/3 inch tall, and about 8 inches by 6 inches. Wrap tightly and place in the fridge for an hour, or until it's firm.
• Preheat the oven to 350°F/175°C and line 2 large baking sheets with parchment paper or Silpat mats while the cookie dough chills. The cookies will spread less and keep their shape better on parchment paper, so I recommend using that if you have it.
• Unwrap the cookie dough and lay the plastic wrap out flat on your counter. We will be cutting the cookie dough on the plastic wrap to make cleanup a breeze. Use a sharp knife to cut out 16 rectangles that are roughly 1 1/2 by 2 inches. The cookies will spread as they bake, so place them at least 1 inch apart on the prepared pans.
• Press two eyeball sprinkles into the bottom third of each cookie and press a heart-shaped sprinkle on each side of the cookie to look like neck bolts (see pictures above).
• Bake one tray at a time for 15-17 minutes. Rotate the pan halfway through to help them bake evenly. Then place the pan on a wire rack and let the cookies cool fully on the pan.
• Once the cookies have fully cooled, microwave the dark chocolate in 15-second intervals, stirring between each, until smooth. Pour the melted dark chocolate into a small piping bag and cut a very small opening at the base of the bag. Pipe a small mouth and a row of stitches onto each cookie. Then snip the opening in the bag slightly larger and pipe the hair onto each cookie. Let the chocolate set, then enjoy!