Position a rack in the center of the oven. Preheat the oven to 450°F. Have ready a large ungreased baking sheet.
Whisk together thoroughly in a large bowl: 1½ cups all-purpose flour, ¼ cup sugar, 1 tablespoon baking powder, and ½ teaspoon salt.
Stir in, using your fingers if necessary to separate the fruit: 1¼ cups old-fashioned rolled oats and ½ cup raisins or chopped dates.
Whisk together, then add all at once: 1 large egg, 10 tablespoons warm melted unsalted butter, and ⅓ cup milk.
Mix until combined and form into 8 large or 12 small scones on the ungreased baking sheet.
Bake until golden brown.