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

In a medium bowl, whisk together flour, baking powder, salt, and cinnamon.

In a large bowl, beat softened butter with granulated sugar and brown sugar until light and fluffy.

Add the egg and vanilla extract to the butter and sugar mixture; beat until smooth.

Gradually add the dry ingredient mixture to the wet ingredients and stir gently until just combined.

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

Roll out half of the dough into a rectangle and sprinkle the filling evenly before rolling it up tightly.

Slice the rolled dough into 1-inch rounds and place them on the baking sheet.

Bake for 10-12 minutes or until golden brown, then remove and cool for 5 minutes.

Transfer to a wire rack to cool completely before enjoying.