Preheat oven to 425 degrees. Lightly butter a baking sheet; set aside. In a small bowl, whisk together egg and milk. Set aside about 1 tablespoon for egg wash.
In a medium bowl, combine flour and butter. Using your fingers, work together until the mixture resembles coarse meal. Add sugar, salt, and raisins. Stir to combine. Gradually add egg mixture, stirring with a fork until the mixture begins to come together and form dough.
Turn out onto a lightly floured surface, and pat out about 3/4-inch-thick. Cut into desired shapes, and transfer to prepared baking sheet. Brush with reserved egg wash. Transfer to oven and bake until golden brown and cooked through, about 15 minutes.