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Oven rack in center.
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Oven 325°F.
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Butter an 11 x 7 baking pan.
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Stir together flour, baking powder, baking soda and salt in a bowl.
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Beat butter in large bowl until creamy, about 1 minute.
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Gradually beat in sugars and continue to beat until light and fluffy, 1-2 minute.
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Beat in egg yolks and vanilla.
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With a spoon, stir in dry ingredients.
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Reserve 3 Tbsp pecans; stir the remaining pecans into the dough.
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Stir together jam and lemon juice in small bowl.
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Press half of the dough, about 1 1/2 cups, evenly in bottom of prepared pan.
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Spread with jam mixture. Crumble remaining dough evenly over top (dough is sticky so this is a bit of work, but persist). Sprinkle top with reserved 3 Tbsp pecans.
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Bake 325° for 60 minutes.
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Cool in pan on wire rack.
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Cut lengthwise down center and then crosswise into 10 equal widths to make 20 bars.