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Preheat oven to 350 degrees F. Lightly grease an 8-inch square metal baking pan. Line the pan with parchment paper and lightly grease the parchment.
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Stir together tahini, brown sugar, and 1 egg in a small bowl.
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Whisk together flour and salt in a small bowl. Take 1 teaspoon of flour mixture and stir into the chocolate chips to coat them with flour.
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Place the oil, butter, and chocolate in a medium stainless steel bowl over simmering water. Stir and cook until chocolate has mostly melted. Remove bowl from over the water. Stir until chocolate has completely melted.
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Add sugar to the chocolate mixture and whisk until combined. Whisk in the remaining 2 eggs and vanilla, one at a time, mixing well after each addition.
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Add flour and stir until just combined. Stir in chocolate chips.
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Spread batter evenly in prepared pan. Drop spoonfuls of tahini mixture on top and swirl using the tip of a knife.
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Bake for 30 minutes or until a toothpick or cake tester inserted in the center comes out with moist crumbs clinging to it.
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Cool completely in the pan on a wire rack. Remove brownies from the pan and cut into 16 squares.