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Preheat your oven to 325°F. Cut out two sheets of parchment as large as your cookie sheets.
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In a medium-sized bowl, whisk together the flours, salt, cocoa, sugar, and baking powder.
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With a pastry blender, two knives, or your fingertips, cut the butter into the flour mixture until evenly crumbly.
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In a separate bowl, combine the honey and milk, stirring until the honey dissolves.
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Add the liquid to the dry ingredients and toss lightly with a fork until the dough comes together. Add additional milk, if necessary.
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Turn the dough out onto a well-floured surface and fold it over gently 10 to 12 times, until smooth.
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Divide the dough in half. Work with half the dough at a time, keeping the remaining dough covered.
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Transfer one piece of dough to a piece of parchment.
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Roll it into a rectangle a bit larger than 10 x 14 inches; the dough will be about 1/16-inch thick.
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Trim the edges and prick the dough evenly with a dough docker or fork.
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Repeat with the remaining dough and parchment.
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Place the rolled-out dough pieces, on their parchment, onto baking sheets.
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Bake the crackers for 15 minutes, or until you begin to smell chocolate.
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Remove them from the oven, and immediately cut them into rectangles with a pizza wheel or knife.
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Transfer them to a rack to cool. Store the cooled crackers tightly wrapped.