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In a large bowl, whisk together the flour, sugar, baking powder, salt, onion powder, and black pepper. Stir in the fresh dill.
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Using a pastry blender or two forks, cut in the cold, cubed butter until crumbly, and the mixture resembles small peas. Carefully stir in the feta, just until incorporated.
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Pour the 1 ¼ cup of cream into the mixture, a little at a time, stirring only until the dry ingredients have moistened and the mixture holds together when pressed.
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Transfer dough ball to a lightly floured surface and lightly knead. Gently press dough into an 8-in circle. Cut into 8 wedges. Place wedges onto a parchment-lined sheet tray, leaving about 1-inch between each. Place the tray into the refrigerator and allow to cool for about 20 minutes.
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While scones are in the refrigerator, preheat the oven to 400° F. In a small bowl, whisk together the egg and a splash of cream. After 20 minutes, remove the tray of scones from the refrigerator. Brush each scone with the prepared egg wash (you will probably not use all of it).
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Bake scones for about 18 to 20 minutes, or until tops are golden. Store scones in an airtight container for up to 3 days.