Preheat oven to 350°. Spray a 10-inch cast-iron skillet with baking spray with flour.
In a medium bowl set over a saucepan of simmering water, combine butter and chocolate; stir until melted. Remove from heat; whisk in sugars. Let cool 5 minutes. Add eggs and vanilla, whisking to combine. In a small bowl, stir together flour, cocoa, and salt. Gently fold flour mixture into butter mixture just until combined. Pour batter into prepared skillet. Spoon caramel over batter. Swirl gently into batter using the tip of a knife.
Bake until a wooden pick inserted in center comes out clean, 35 to 40 minutes.
Notes
*We used Smucker’s brand hot caramel topping.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/chocolate-caramel-swirled-brownies/