Preheat oven to 350°F (175°C). Line a 9×13” pan with parchment paper.
In a large bowl, mix melted butter, brown sugar, and granulated sugar until smooth.
Stir in sourdough discard, eggs, and vanilla extract until combined.
In a separate bowl, whisk flour, baking soda, and salt. Gradually mix into wet ingredients.
Fold in chocolate chips.
Spread half of the dough into the prepared pan.
Pour thick caramel sauce over the dough and gently spread.
Drop spoonfuls of remaining dough over the caramel layer no need to fully cover it.
Bake for 25–30 minutes until golden and slightly set in the center.
Sprinkle flaky sea salt on top while warm. Cool before slicing.
