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Preheat oven to 350 F. Prepare an 8 x 8 baking pan lined with parchment paper hanging on the sides. Lightly grease and set aside. Place the oven rack in the center of the oven.
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In a large bowl, add in butter and sugar. Mix until fluffy. Add honey, eggs, vanilla and milk. Mix until well combined. Add melted chocolate and mix again.
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Add flour, baking powder, salt, and espresso powder on the same bowl. Mix again until well incorporated. Make sure not to overmix. Use a silicone /rubber spatula to scrape down the sides and bottom of the bowl.
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Transfer the batter to the prepared baking pan.
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Top with peanuts.
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Bake for 25-30 minutes or until a toothpick inserted in the middle comes out clean.
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Remove from the oven and leave brownies in the pan for 10 minutes, then transfer to a cooling rack to cool completely before cutting.