Preheat your oven to 350°F (175°C).

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

In a separate bowl, beat together softened unsalted butter, granulated sugar, and brown sugar until light and fluffy.

Add the egg and vanilla extract to the creamed mixture and mix until fully incorporated.

Gently fold the dry ingredient mixture into the wet ingredients until just combined.

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

Spread half of the prepared dough into a rectangle, sprinkle with filling, and roll it up tightly.

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

Bake for 10-12 minutes or until edges are lightly golden.