# What You'll Need:
→ Blondie Batter
01 - 1 cup unsalted butter, melted and slightly cooled
02 - 1 cup light brown sugar, packed
03 - 1/2 cup granulated sugar
04 - 2 large eggs
05 - 2 teaspoons vanilla extract
06 - 1 1/2 cups all-purpose flour
07 - 1 cup old-fashioned rolled oats
08 - 1/2 teaspoon baking powder
09 - 1/2 teaspoon baking soda
10 - 1/2 teaspoon salt
→ Cinnamon Swirl
11 - 1/3 cup light brown sugar, packed
12 - 1 1/2 teaspoons ground cinnamon
13 - 2 tablespoons unsalted butter, melted
# How to Make It:
01 - Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - Whisk melted butter, brown sugar, and granulated sugar together in a large mixing bowl until fully blended.
03 - Incorporate eggs and vanilla extract into the mixture and whisk until smooth.
04 - Stir in flour, rolled oats, baking powder, baking soda, and salt just until no dry spots remain. Do not overmix.
05 - Mix brown sugar, ground cinnamon, and melted butter in a small bowl until a thick paste forms.
06 - Spread half the blondie batter evenly into the prepared pan. Drop half of the cinnamon swirl mixture in dollops across the surface and gently swirl with a knife or skewer.
07 - Layer the rest of the blondie batter over the swirled base. Dollop and swirl the remaining cinnamon mixture into the top layer.
08 - Bake for 25 to 28 minutes, until the edges turn golden and a toothpick inserted in the center yields a few moist crumbs.
09 - Allow to cool completely in the pan. Lift out using the parchment paper and cut into squares for serving.
