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Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish with cooking spray or butter.
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In a large mixing bowl, whisk together the melted butter, sugar, cocoa powder, salt, baking powder, and vanilla extract until well combined.
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Beat in the eggs, one at a time, until the mixture is smooth and glossy.
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Fold in the flour and chocolate chips until just combined.
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Pour the batter into the prepared baking dish and smooth the top with a spatula.
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Combine the sweetened condensed milk, unsalted butter, and corn syrup in a small saucepan over low heat. Stir constantly until the butter is melted and the mixture is smooth.
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Remove the pan from the heat and stir in the vanilla extract.
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Drizzle the caramel sauce over the brownie batter, using a spatula or knife to swirl it into the batter.
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Bake the brownies for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
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Allow the brownies to cool in the pan for at least 10 minutes before slicing and serving.