Prepare the Batter:

• Preheat your oven to 350°F (175°C). Grease an 8×8 inch baking pan or line it with parchment paper.
• In a large bowl, whisk together the melted butter, brown sugar, and granulated sugar until combined.
• Add the eggs and vanilla extract, mixing until smooth.
• In another bowl, combine the flour, baking powder, and salt.
• Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Create the Cinnamon Swirl:

• Pour half of the blondie batter into the prepared pan.
• Sprinkle 1 teaspoon of cinnamon evenly over the batter.
• Add the remaining batter over the cinnamon layer.

Bake:

• Bake in the preheated oven for 25-30 minutes or until the top is set and a toothpick comes out mostly clean.
• Let the blondies cool completely in the pan.

Make the Frosting:

• In a bowl, beat the softened cream cheese and butter together until creamy.
• Gradually add the powdered sugar and vanilla extract, beating until well combined and smooth.
• Add the remaining teaspoon of cinnamon and mix until incorporated.

Assemble:

• Spread the frosting over the cooled blondies.
• Optionally, dust with additional cinnamon for garnish.