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Preheat the oven to 350 degrees.
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Lightly grease a 9 x 13 inch baking dish.
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Combine the melted butter, sugars and vanilla in a large bowl.
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Beat in the eggs, one at a time, mixing well after each until thoroughly blended.
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Sift together the flour, cocoa powder and salt.
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Gradually stir the flour mixture into the other mixture until blended.
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Stir in the chocolate chips.
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Spread the batter evenly into the prepared baking dish.
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Bake in preheated oven until a toothpick inserted into the center comes out clean, approximately 35-37 minutes.
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Remove and cool pan on a wire rack before cutting.