Cinnamon Chip Scones

all-purpose flour (careful not to overmeasure)

packed light or dark brown sugar

and 1/2 teaspoons baking powder

and 1/4 teaspoons ground cinnamon

salt

unsalted butter, frozen

heavy cream (plus a little extra for brushing)

large egg

vanilla extract

and 1/4 cups cinnamon chips1

optional: coarse sugar for sprinkling on top before baking

confectioners' sugar

black coffee (or milk/half-and-half/cream for a plain vanilla glaze )

vanilla extract