In a medium bowl whisk together the flour, salt, and baking powder.
In a big bowl, beat the butter and sugar until creamy using a hand mixer (about 2 to 3 minutes). Add the egg, beating until well combined.
Beat in the vanilla paste. Add the flour mixture and mix with a wooden spoon until you have a smooth dough. If the dough is too soft, cover and refrigerate until firm (about 1 hour).
Preheat oven to 400F (190C) and place rack in the centre of the oven. Line baking sheet with parchment paper.
Shape the dough into 2.5 cm round balls.
Coating: In a large bowl mix together the sugar and cinnamon.
Roll the balls of dough in the cinnamon sugar and place on the prepared baking sheet, spacing about 4 cm apart. Using the bottom of a glass to gently flatten each cookie before baking will help to have an even bake.
Bake the cookies for about 8 - 10 minutes, or until they are light golden brown and firm around the edges and the centre of the cookies will still be a little soft.
Remove from oven and place on a wire rack to cool.