Preheat the oven to 180°C (356°F).
Mix cake flour, baking powder, sugar, and salt in a bowl.
Separate the tea leaves from the Earl Grey tea bag and prepare them as powder.
Cut cold butter into small pieces, add to the bowl, and mix with your fingertips until combined.
Add egg and milk, then gather everything into a dough.
Roll the dough out to a thickness of 2cm and cut into your desired shapes.
Place on a baking sheet and brush the tops with milk.
Bake in the preheated oven for 18–20 minutes.