Preheat oven to 350 degrees.
Sift together flour, baking powder and salt. Set aside.
Cream together the butter and 1 ½ cups sugar until pale yellow, about 2 - 3 minutes.
Mix in eggs until well combined.
Add the flour mixture, ½ cup at a time, until the dough comes together.
In a separate, small bowl, combine ½ cup sugar and cinnamon together.
Shape dough into about 1 ¾ inch balls and roll the balls in the cinnamon sugar.
Space the balls about 3 inches apart on an ungreased baking sheet
Bake for 9 - 10 minutes.
Remove from oven and transfer to a wire cooling rack.