Ingredients:
- 1 cup (225g) unsalted butter, melted and cooled
- 1.5 cups (300g) light brown sugar, packed
- 0.5 cup (100g) granulated sugar
- 2 large eggs, room temperature
- 1 tbsp vanilla bean paste
- 2 cups (250g) all-purpose flour
- 0.75 tsp kosher salt
- 4 tbsp (56g) unsalted butter, very soft
- 0.25 cup (50g) light brown sugar
- 1.5 tbsp ground cinnamon
- 4 oz (115g) full-fat cream cheese, softened
- 2 tbsp (28g) unsalted butter, softened
- 1 cup (120g) powdered sugar
- 1.5 tbsp heavy cream
- 1 pinch salt
Instructions:
- Preheat your oven to 350°F (180°C). Grease an 8x8 inch pan and line it with parchment paper as described above.
- In a large glass whisking bowl, combine the 1 cup melted butter with 1.5 cups light brown sugar and 0.5 cup granulated sugar. Whisk vigorously for at least 2 minutes until the mixture transitions from grainy to smooth.
- Add the 2 large eggs and vanilla bean paste. Whisk until the mixture is fully emulsified and slightly pale.
- Using a rubber spatula, gently fold in the 2 cups of all-purpose flour and 0.75 tsp kosher salt until just combined. Do not overmix.
- In a separate small bowl, mix 4 tbsp soft butter, 0.25 cup brown sugar, and 1.5 tbsp cinnamon until it forms a thick paste for the swirl.
- Spread two thirds of the blondie batter into the prepared pan. Drop dollops of the cinnamon mixture over the batter, then top with the remaining blondie batter. Use a butter knife to swirl the layers together until you see beautiful marbling.
- Bake for 25 minutes until the edges are golden brown and the top has a crackly, meringue-like appearance. Let cool completely in the pan.
- For the frosting, beat the 4 oz cream cheese and 2 tbsp butter until smooth. Gradually add 1 cup powdered sugar, heavy cream, and a pinch of salt. Whisk until silky.
- Spread the frosting over the cooled blondies, lift from the pan using the parchment overhang, and slice into 16 bars.