In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
In a large bowl or stand mixer, cream together the softened butter and 1 1/2 cups of sugar until light and fluffy, about 3-4 minutes.
Beat in the eggs one at a time, then stir in the vanilla extract.
Gradually mix in the dry ingredients until just blended.
Cover the dough and chill for at least 1 hour or overnight.
Preheat the oven to 375°F (190°C). Line baking sheets with parchment paper.
In a small bowl, mix together the 1/4 cup of sugar and cinnamon for rolling.
Roll the chilled dough into 1-inch balls, then roll each ball in the cinnamon-sugar mixture to coat.
Place the cookies 2 inches apart on the prepared baking sheets.
Bake for 10-12 minutes, or until the edges are lightly golden.
Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.