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Preheat oven to 350 degrees F. Lightly grease a 9x13 inch baking pan and line with parchment paper if you want.
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As noted in the recipe description, some people prefer these date squares with less filling so you can reduce the amounts in the filling by 1/4, 1/3 or even 1/2 if you prefer.
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In a medium saucepan combine and gently simmer all of the filling ingredients until thickened (about 10-15 minutes).
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The filling should be very thick; you will need to watch it carefully and stir constantly in the last few minutes of cooking time so that it doesn't burn.
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Set aside to cool slightly while you prepare the crumble mixture.
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To prepare the crumble
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In a large bowl, toss together the rolled oats, baking powder, coconut, flour and brown sugar.
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Using your hands, rub the butter thoroughly through the dry ingredients.
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Divide crumble mixture in half and press half into the bottom of the prepared baking pan.
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Spread date mixture over the base.
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Top with remaining crumb mixture, pressing it together in clumps in your hands and then breaking it into small pieces with your fingers to scatter evenly over the date filling.
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Press down lightly.
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Bake for 40 minutes at 350 degrees F.
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This is a very good basic recipe but I have also had very good variations of date crumbles over the years.