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["In a bowl, beat the butter with the sugar until light and fluffy.", "Beat in the egg and vanilla.", "Stir the flour together with the baking powder.", "Add to the butter mixture in 2 additions.", "Divide the dough in half and flatten into discs.", "Wrap in plastic wrap and refrigerate for at least 1 hour or until chilled.", "Between sheets of waxed paper or plastic wrap, roll out each portion to 12"" x 8"" rectangle.", "Remove the top paper and brush the dough lightly with the beaten egg.", "Sprinkle the coloured sugar evenly over the top.", "Using the bottom paper as a guide and starting at the long side, tightly roll up the dough.", "Wrap again in plastic wrap, twisting the ends to seal well.", "Refrigerate the logs for about 3 hours or until firm.", "Grease or line rimless baking sheets with parchment paper and set aside.", "Cut the logs into 1/4"" thick slices and place about 1"" apart on the prepared pans.", "Bake in the top and bottom thirds of a 375 degree F oven, rotating and switching pans halfway through, for 8 to 10 minutes or until golden.", "Let cool on the pans on a rack for 5 minutes.", "With a spatula, transfer the cookies to a rack and let cool completely."]
