I would try using it in a simple shortbread or tea cookie. I've had success replacing up to 1/4 of the flour with cocoa powder in a buttery tea cookie recipe, so I see no reason why you couldn't try it with the ground chocolate (start with 2 tablespoons and work your way up). Just keep in mind that you may need to adjust the sugar, since the ground chocolate you want to use contains sugar.
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Well played. You deserve a cookie.
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