Preheat your oven to 350°F (180°C). Grease a baking pan or line it with parchment paper.
In a bowl, combine the flour, baking powder, and salt. Set aside.
In a separate bowl, cream together the softened butter and granulated sugar until light and fluffy.
Beat in the egg and vanilla extract until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing until a dough forms.
Press the dough evenly into the prepared baking pan.
In a small bowl, mix together the ground cinnamon and granulated sugar. Sprinkle this mixture over the dough.
Bake in the preheated oven for 25-30 minutes, or until the edges are golden brown.
Allow the cookie bars to cool in the pan before cutting them into squares or bars.
Enjoy these chewy Snickerdoodle cookie bars with a glass of milk or your favorite hot beverage.
