"These coveted brownie bars are homey and chocolaty awesome. They've been a sought-after staple on Christmas cookie trays for years. —Troy Shaw, Warrenton, Oregon..."
INGREDIENTS
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3/4 cup butter, softened
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3/4 cup packed brown sugar
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1 large egg yolk, room temperature
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3/4 teaspoon vanilla extract
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1-1/2 cups all-purpose flour
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FILLING:
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1 package fudge brownie mix (13x9-inch pan size)
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1/3 cup water
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1/3 cup canola oil
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1 large egg, room temperature
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TOPPING:
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1 package (11-1/2 ounces) milk chocolate chips, melted
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3/4 cup chopped salted roasted pistachios