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Part 1: Brownies
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Grease a 9 x 13 baking pan. Line the pan with parchment paper, leaving 1-2 inches to hang over the sides. Grease the parchment paper.
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Melt 2 sticks of butter, 1 2/3 cups of chocolate chips and 3 ounces of unsweetened chocolate in the microwave, stirring every 30 seconds until melted and smooth. Let this mixture cool until warm.
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Use a spatula and stir the sugar, eggs and 1 tablespoon vanilla extract until just mixed. Mix in the melted chocolate mixture.
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Sift the 1/2 cup flour, baking soda, baking powder and 1/2 teaspoon salt into the chocolate mixture and stir until just combined.
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Mix together another 1 2/3 cups chocolate chips, the chopped peanuts and the remaining 1 tablespoon flour. Fold into the chocolate mixture.
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Pour into the prepared baking pan and bake for 35 minutes at 350 degrees. The center of the brownies will still be soft, but do not overbake.
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Part 2: Peanut Butter Icing
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Using a hand mixer, blend peanut butter with 6 tablespoons of butter. Add the powdered sugar, remaining 1/4 teaspoon salt, nutmeg, milk and 1/2 tablespoon vanilla extract. Mix well.
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When the brownies have cooled, spread the icing over the top of the brownies with a spatula. This can be a little messy, but just make sure that the icing is evenly spread over the brownies.
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Refrigerate until slightly cool.
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Part 3: Chocolate Ganache
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Microwave the remaining chocolate chips with remaining 4 tablespoons of butter, stirring every 30 seconds, until melted and smooth.
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Pour the ganache over the top of the icing and spread with a spatula.
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Refrigerate until the ganache is set. Cut into squares and serve.