Preheat the oven to 350°F. Line an 8x8 baking dish with foil and spray with cooking spray.
For the Blondies: In a large bowl, cream together the melted butter and brown sugar. Add the egg and vanilla and mix until combined. Add the salt and flour and mix until smooth. Spread mixture in the prepared pan.
For the Filling: In a small bowl, combine the butter, brown sugar, and cinnamon. Spoon dollops of the mixture over the blondie batter. With a knife, swirl the mixture into the batter.
Bake for 23-28 minutes or until the center isn't jiggly. Cool completely.
For the frosting: In a medium bowl, combine the cream cheese, butter, vanilla, and powdered sugar. Once the ingredients have combined, whip the frosting until fluffy.
Frost the cooled blondies and sprinkle with chopped Like Air Cinnamon Bun Puffcorn.