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Preheat the oven to 350ºF.
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Grease a 9x13" baking dish.
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In a large bowl mix together the cocoa and baking soda.
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Stir in 1/3 cup of the melted butter until smooth.
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Next, Stir in the boiling water until the mixture is thick.
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Then stir in the sugar and eggs and the remaining 1/3 cup melted butter.
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Then, stir in the vanilla and salt until just smooth.
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Add in the flour and chocolate chips and stir until combined.
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Spread the batter into the baking dish and bake for 35-40 minutes, or until the edges start to pull away from the pan. (I prefer slightly under-baked brownies)