Preheat the oven to 350 degrees and line a baking sheet with parchment paper.
Whisk together the flour, cocoa powder, matcha powder, baking powder, and salt in a bowl.
In a separate bowl, beat the softened butter and brown sugar until light and fluffy.
Add the egg and vanilla extract to the butter mixture and mix until combined.
Stir the dry ingredients into the wet ingredients until a dough forms, then fold in the chocolate chips.
Scoop the dough into 8 portions and place them on the baking sheet, flattening each slightly.
Bake for 10 to 12 minutes until the edges are set but the centers still look soft.
Remove from the oven and immediately press two candy eyes onto each cookie while warm.
Drizzle the melted white chocolate over the cookies to create stitch-like lines across the faces.