In a medium mixing bowl, whisk to combine flour, baking powder, salt and cinnamon. Set aside.
In a large mixing bowl or stand mixer, cream butter and sugar until light and fluffy, approximately 3 minutes.
Add egg and vanilla. Beat until just combined.
Gradually add dry mixture to wet mixture until combined.
Cover dough and chill 2 hours.
Preheat oven to 350°F. Optional: Line baking sheets with parchment paper.
In a small bowl, combine cinnamon sugar to make topping.
Using a cookie scoop or a teaspoon and the palm of your hands, roll dough into 1" balls. Roll in cinnamon sugar.
Optional: Insert red hot onto center of dough ball.
Bake 10 minutes or until lightly brown. Allow to cool 1 minute before moving to a cooling rack.