Preheat the oven to 180°C (356°F).
In a bowl, mix whole wheat flour, baking powder, salt, and sugar.
Cut cold butter into small pieces and mix with fingertips until crumbly.
Add milk and egg, and gently bring the dough together.
Place dough on a board, roll out to 2–3cm thickness, and cut into triangles or circles.
Place on a baking pan and brush the surface with milk.
Bake in the oven for 20–25 minutes.