INGREDIENTS
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1 cup butter, melted, plus more for pan
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1 cup unsweetened cocoa
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2 cups sugar
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4 eggs
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4 teaspoons vanilla extract
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1 cup all-purpose flour
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1/2 teaspoon salt
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1 cup chopped peanut butter cups, about 8 pieces (recommended: Reese's)
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1/4 cup peanut butter, plus 2 tablespoons, heated in microwave at 10 second intervals for easy spreading
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1/4 cup confectioners' sugar
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1/2 cup warm water, plus more as needed
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1/2 cup chocolate chips