Preheat oven to 375°F. Line baking sheets with parchment paper.
In a bowl, whisk together flour, baking powder, and salt. Set aside.
Cream butter, sugar, and brown sugar until light and fluffy.
Add eggs one at a time, then mix in vanilla extract.
Gradually add dry ingredients, mixing until dough forms.
Combine cinnamon and sugar in a small bowl. Roll dough balls in coating.
Place on baking sheet, slightly flatten, and bake for 8-10 minutes.
Let cookies cool on sheet for 5 minutes, then transfer to a wire rack.