**Notes: I use Callebaut cocoa powder. It is high quality but it can be found for an incredibly low price at a Winco grocery store in their bulk bins. It's 4 times as much on Amazon. Trader Joe's has a nice cocoa powder as well.
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Instructions
Preheat oven to 360 degrees.
In a large mixing bowl, cream cold butter cubes and sugar for at least 4 minutes, scraping the bowl halfway through mixing.
Add eggs one at a time, mixing well after each addition. Add in vanilla.
Stir in flour, cocoa, baking powder, and salt. Stir in chocolate.
Drop large spoonfuls onto cookie sheet lined with a Silpat or parchment paper.