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Make the dough and chill for at least 2 hours or overnight.
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Preheat the oven to 350F and line a baking sheet with parchment paper. Spread the peanuts out evenly on the sheet and bake for 8-10 minutes, till fragrant and the skin is turning golden brown.
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Allow the peanuts to cool on the baking sheet for a few minutes. Once cooled, transfer the peanuts to a large tea towel. Wrap the towel around all the peanuts and give them a good rubbing to loosen the skins. Transfer the peanuts to a cutting board and chop them coarsely. Set aside 1/4 cup of the chopped peanuts to garnish the tops of the cookies before baking.
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In the bowl of a stand mixer, add the brown sugar, butter, peanut butter, honey and miso. Use the paddle attachment to cream them all till smooth, at medium speed for about 1 minute.
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Add the egg and mix again on low speed. Add the egg yolk and mix again. Scrape down the sides as needed.
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Add the milk and vanilla and mix again.
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Add the flour mixture and peanuts and mix on low speed till well blended.
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Transfer the dough to a bowl that will fit into the fridge. Cover with plastic wrap or a lid. Chill for at least 2 hours or ideally till the next day.
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Preheat the oven to 350F. Line two baking sheets with parchment paper. Blend the turbinado sugar and salt in a small shallow bowl.
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Using a tablespoon or scoop, make 1 inch balls with the dough. Roll these in the sugar mixture and transfer to the baking sheet. Space them at least 1 1/2 inches (3.25 cm) apart. Sprinkle a few of the chopped peanuts on top of each cookie. Use a fork to flatten the cookies slightly, in either a cross hatch or single pressing pattern.
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Bake until the edges are crisp and golden brown but the centres are soft, about 11 minutes, depending on your oven. Make sure to rotate the sheets from side to side, and back to front halfway through the baking time.
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Let the cookies cool on the baking sheets for about 10 minutes and then transfer them to a cooling rack. They will keep in an airtight container for 3-5 days, or can be stored in the freezer for a month or so.