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mix flour, baking soda and salt
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brown butter in a pan
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mix sugar and vanilla with the dry ingredients
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add brown butter slowly to the dry ingredients
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add eggs, expresso powder and chocolate chips while mixing
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chill for 10-15 minutes
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ball and place on a baking sheet with parchment paper
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bake in the oven at 350° for 10 minutes
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let rest for 2-3 minutes