01 - Line a 9x9-inch baking pan with parchment paper and lightly grease the surface. Prepare the brownie batter according to package or recipe instructions.
02 - Pour half of the brownie batter evenly into the prepared pan, smoothing the surface with a spatula.
03 - Drizzle caramel sauce over the batter, then evenly sprinkle sea salt flakes on top.
04 - Spread the remaining brownie batter over the caramel layer, gently swirling with a knife or skewer to create a marbled effect.
05 - Bake the brownies according to the standard baking time and temperature for the chosen batter, typically at 350°F for 25 to 30 minutes, or until a toothpick inserted in the corner comes out with moist crumbs.
06 - Allow brownies to cool completely in the pan on a wire rack before lifting out and slicing into squares.