Preheat your oven to 350°F (175°C).

In a large bowl, whisk together the all-purpose flour, baking powder, salt, and ground cinnamon. Set aside.

In a separate mixing bowl, cream the softened unsalted butter with granulated sugar and brown sugar until light and fluffy.

Beat in the large egg and vanilla extract into the creamed mixture until smooth.

Gradually add the dry ingredients into the wet mixture, mixing until the dough comes together.

In a small bowl, mix the brown sugar and cinnamon to create the filling for your cookies. Set aside.

On parchment paper, spread half of the dough evenly to about 1/4-inch thick. Sprinkle half of the prepared filling across the dough.

Roll the dough into a tight log and slice into rounds about 1 inch thick. Place rounds onto a lined baking sheet.

Bake for 10-12 minutes, until edges are lightly golden but centers remain soft.

Let cookies cool for a few minutes before transferring to a wire rack.