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sift flour, baking powder, beat together margarine, sugar, and egg in another large bowl till fluffy --
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stir in vanilla, gradually add flour mixture, stirring till well combined.
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roll dough between 2 pcs of wax paper to 12x10 rectangle.
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remove top piece of wax paper.spread jam over entire surface od dough.sprinkle with nuts, firmly roll up dough from long side.
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remove wax paper --
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reroll in wax paper and refrigerate dough overnight in the refrigerator --
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preheat oven to 375*.
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cut roll into generous 1/4" slices.with sharp knife.
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place on ungreased cookie sheet -- 2" apart.
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bake 9 minutes or golden brown.do not overbake --
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cool on wire rack -- .