Preheat oven to 350 °F
Line a baking sheet with parchment or a silpat liner, set aside
In medium sized mixing bowl combine flour, baking powder, and salt. Set aside.
1 ⅓ cup all-purpose flour, ¾ teaspoon baking powder, ⅛ tsp salt
In the bowl of an electric mixer combine butter and sugar and mix until creamy. Add in egg and mix.
½ cup butter, ¼ cup sugar, 1 egg
Add the flour in, about ½ at a time, until fully combined.
If dough is too warm, chill for 10 minutes in refrigerator.
Roll dough into 1 ½ inch balls and roll in the cinnamon sugar mixture.
¼ granulated sugar, 3 teaspoons cinnamon
Place coated balls on baking sheet about 2 inches apart (they will spread when cooking).
Flatten cookies with the bottom of a glass.
Bake for 7-10 minutes until just golden brown.
Remove from oven and let sit on pan for 5 minutes, then move to a cooling rack.