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1
Preheat oven to 400 degrees F (200 degrees C).
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2
Spray a baking sheet with cooking spray.
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3
Mix flour, 1/4 cup sugar, baking powder, and salt in a bowl.
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4
Add butter and mix with fingers until coarse crumbs form.
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5
Gently mix yogurt, egg, and vanilla extract into flour mixture until dough is just combined.
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6
Turn the dough out onto a lightly floured surface and knead briefly, for five or six turns.
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7
Pat or roll the dough out into a 1-inch thick round.
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8
Cut into 8 wedges and place onto the prepared baking sheet.
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9
Brush each wedge with milk and sprinkle with remaining 1 tablespoon sugar.
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10
Bake in the preheated oven until lightly browned, about 15 minutes.
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11
Serve warm or cool completely and store in an airtight container.
