Preheat the oven to 350°F and line a muffin tin with 4 paper liners.
In a medium bowl, whisk together the flour, granulated sugar, matcha powder, baking powder, and salt.
In a separate small bowl, mix the milk, vegetable oil, vanilla extract, and egg until combined.
Pour the wet mixture into the dry ingredients and stir gently until no dry streaks remain.
Divide the batter evenly among the 4 liners and bake for 15-18 minutes, or until a toothpick inserted in the center comes out clean.
Cool the cupcakes completely on a wire rack.
In a small bowl, beat the powdered sugar and softened butter until smooth to make the frosting.
Spread or pipe the frosting on each cooled cupcake.
Press two candy eyes into the frosting on each cupcake.
Drizzle or pipe the melted chocolate chips to form hair across the top and two small bolts on the sides.