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Melt butter, then set aside to cool slightly.
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In a medium bowl (or paper plate), sift together flour, salt and baking soda.
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Pour butter into a mixer bowl. Add sugars and beat at medium speed with the paddle attachment for 2 minutes.
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In another bowl, whisk together egg and egg yolk, milk, and vanilla extract.
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Set mixer to slow or stir, and slowly add the egg mixture. Mix until thoroughly combined.
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Gradually add the dry ingredients at medium speed, scraping the bowl as necessary.
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Return the speed to stir and add chocolate chips.
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Chill dough for 1 hour.
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Heat oven to 375. Scoop the dough into 1 1/2-ounce portions onto parchment or a silpat. Bake for 15 minutes, rotating the pans if necessary.
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Cool cookies on a cooling rack and allow to cool for at least 5 minutes before serving.
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Yields approximately 2 dozen cookies.