Preheat your oven to 350°F (175°C) and prepare your baking sheet with parchment paper.

In a large bowl, whisk together the flour, baking powder, salt, and ground cinnamon until well combined.

In a separate bowl, cream together the butter, granulated sugar, and brown sugar until light and fluffy.

Add the egg and vanilla extract to the mixture and beat until fully combined.

Gradually incorporate the dry ingredients into the wet mixture until just combined.

In a small bowl, combine the brown sugar and ground cinnamon for the filling.

Spread half of the cookie dough into a rectangle on parchment paper, sprinkle the cinnamon filling, and roll tightly.

Slice the roll into 1-inch rounds and arrange on the baking sheet.

Bake for 10-12 minutes, until golden brown at the edges and soft in the center.

Allow cookies to cool for 5 minutes on the baking sheet before transferring to a wire rack.