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Preheat oven to 325* --
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whisk together flour, cocoa powder, baking soda, and salt in a medium bowl -- set aside.
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Melt coarsely chopped milk chocolate with the butter in a small heatproof bowl, set over a pan of simmering water.
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transfer chocolate mixture to the bowl of an electric mixer fitted with the paddle attachment --
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add sugar, eggs and vanilla -- mix on medium speed until combined --
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reduce speed to low, gradually mix in flour mixture --
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fold in chocolate chunks.
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scoop batter using a 1 1/2" ice cream scoop, place 2" apart on parchment lined baking sheets.
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bake until cookies are flat and surfaces begin to crack.about 15 minutes.
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transfer parchment paper to wire racks.
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let cool 5 minutes.
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cookies can be stored in an airtight container at room temperature for up to 3 days.