Preheat your oven to 350°F (175°C). Prepare a 9x13 inch baking pan by greasing or lining it.

Melt 1 cup of unsalted butter over low heat, stirring constantly. Remove from heat and cool slightly.

Add 1 cup granulated sugar and 1/2 cup light brown sugar to the melted butter, whisking until smooth. Stir in 2 eggs and 1 teaspoon vanilla extract.

In another bowl, whisk together 1 cup all-purpose flour, 1/2 cup cocoa powder, and a pinch of sea salt.

Fold the dry ingredients into the wet mixture until just combined.

Pour half of the brownie batter into the prepared pan, drizzle with half of the caramel sauce, and swirl together.

Add the remaining batter on top, drizzle with remaining caramel, and swirl again.

Bake for 25-30 minutes. Check doneness with a toothpick.

Cool in the pan for 20-30 minutes before slicing and serving.