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Preheat oven to 350 degrees.
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Mix butter, margarine, shortening or oil with sugar.
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Add eggs and vanilla and mix well.
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Add the flour, baking powder, and salt and mix well.
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Stir in the nuts and chocolate chips.
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Spread into a greased 9x11 pan.
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Bake for 25 minutes. Do not overbake! Cut bars while still warm.