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

In a medium bowl, whisk together all-purpose flour, baking powder, salt, and ground cinnamon.

Cream together unsalted butter, granulated sugar, and brown sugar in a large mixing bowl until light and fluffy.

Add the egg and vanilla extract to the butter and sugar mixture, mixing until fully incorporated.

Gradually mix in the dry ingredients until just combined to form a soft dough.

Combine brown sugar and ground cinnamon for filling and roll half of the dough into a rectangle. Spread half of the filling on top.

Roll the dough tightly into a log shape and slice into 1-inch rounds. Repeat with remaining dough and filling.

Place the slices on the baking sheet and bake for 10-12 minutes until edges are golden brown.