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Cook the dates and water together, stirring frequently, until soft and amalgamated.
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Let cool.
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Preheat the oven to 325°F.
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Butter a large cookie sheet.
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Stir together the dry ingredients.
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Beat together the cooled melted butter and eggs, then beat in the buttermilk.
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Mix the beaten butter and egg mixture into the dry ingredients, adding a little more buttermilk if needed to make a soft dough.
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Drop half the dough by spoonfuls onto the cookie sheet.
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Space them well apart.
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Divide the filling evenly over the cookie bases.
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Spoon the remainder of the dough over the cookies.
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Bake for 20 minutes.