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In a bowl, whisk together the butter and sugars
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Add in the egg and vanilla extract
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Whisk until the mixture is smooth
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Sift in the flour, baking powder, and salt
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Fold in the chocolates and walnuts.
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Cover the bowl and refrigerate for at least 30 minutes or overnight.
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Preheat the oven to 350 F
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Scoop out the dough using a cookie scoop* onto a parchment paper lined baking sheet leaving a few inches of space between each cookie for expansion
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Bake for 10-12 minutes or until the edges have browned. (Do NOT over bake)
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Allow the cookies to cool completely on a wired cooling rack before serving
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Enjoy!