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For the crust:.
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Combine flour, baking powder& salt, set aside.
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Cream butter,sugar and shortening until light and fluffy.
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Add egg and vanilla and beat until well combined.
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Add dry ingredients, stirring until dough forms a ball.
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Wrap dough and refrigerate overnight.
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Preheat oven to 375°F Between 2 sheets of waxed paper roll the dough into a 15x10 inch rectangle 1/8 inch thick.
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Remove top sheet of waxed paper and invert onto a 15x10 inch jelly roll pan.
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Remove remaining wax paper and if necessary, patch the dough.
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Prick the dough liberally with a fork to prevent shrinkage during baking, and bake 10 minutes (DO NOT BROWN).
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Cool completely and reduce oven temperature to 350°F.
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For the Filling:.
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In a large saucepan combine butter, honey,and both sugars and bring to a boil over medium heat.
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Stir in nuts and mix thoroughly.
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Stir in cream and mix thoroughly.
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Set cooled partially baked crust into a pan of the same size (this is necessary to prevent burning of the crust while topping caramelizes).
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CAREFULLY spread pecan mixture over partially baked crust (mixture will be extremely hot and can severly burn you).
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Bake 35 minutes in 350F oven.
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Cool completely in pans on wire rack.
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Once cool cut crosswise into 1 1/2 inch stips, then cut diagonally at 2 inch intervals to form diamonds.
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**It is recommended that you do not use dark coated baking pans for this recipe.
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If you must, shorten baking time by at least 10 minutes.