Preheat the oven to 180°C (350°F) and line a baking tray with baking paper.
In a large bowl beat the butter, brown sugar, and granulated sugar with an electric mixer until smooth and fluffy.
Add the egg and beat until just combined.
Add the flour and baking soda, then mix until a soft cookie dough forms.
Stir in the white chocolate chips until evenly distributed.
Divide the dough into three equal portions.
Mix the first portion with the ube extract, the second with matcha powder, and the third with orange zest and orange food coloring.
Divide each colored dough into three balls, making 9 cookies total.
Place the dough balls on the prepared baking tray and flatten them slightly with your hand.
Bake for 10 to 14 minutes, or until the edges are set and the centers look soft.
Remove from the oven and let the cookies cool on the tray for 5 to 10 minutes.
Once cooled slightly, decorate with candy eyeballs and sprinkles before serving.