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Heat oven to 350°F.
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Line 13x9x2 inch baking pan with parchment paper, set aside.
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Stir together cocoa powder and baking soda in large bowl; stir in 1/3 cup melted butter. Add boiling water; stir until mixture thickens.
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Stir in sugar, eggs, and remaining melted butter until mixture is smooth.
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Add flour, vanilla, and salt; stir until completely blended together.
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Stir in peppermint patties.
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Pour into prepared pan, and spread evenly.
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Bake 35-40 minutes, or until brownies start to pull away from sides of pan.
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Cool completely in pan on wire rack
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Cut into bars.