01 - Heat oven to 350°F and line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, cinnamon, and salt; set aside.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, about 2 minutes.
04 - Add egg and vanilla extract, mixing until fully incorporated.
05 - Gradually add dry mixture to wet ingredients, stirring just until combined.
06 - Mix granulated sugar and ground cinnamon in a small bowl.
07 - Scoop tablespoon-sized dough portions; roll each into a ball and coat in cinnamon-sugar mixture.
08 - Place dough balls 2 inches apart on prepared sheets.
09 - Gently press each ball flat with the bottom of a glass.
10 - Bake for 10 to 12 minutes until edges turn golden.
11 - Allow cookies to cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.