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Heat oven to 375°F.
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Melt the butter in a heavy-bottom medium saucepan over low heat.
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Sift together the flour, salt, and baking soda and set aside.
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Pour the melted butter in the mixer's work bowl.
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Add the sugar and brown sugar.
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Cream the butter and sugars on medium speed.
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Add the egg, yolk, 2 tablespoons milk and vanilla extract and mix until well combined.
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Slowly incorporate the flour mixture until thoroughly combined.
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Stir in the chocolate chips.
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Chill the dough, then scoop onto parchment-lined baking sheets, 6 cookies per sheet.
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Bake for 14 minutes or until golden brown, checking the cookies after 5 minutes.
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Rotate the baking sheet for even browning.
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Cool completely and store in an airtight container.