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In a mixing bowl, beat flour, 1 cup brown sugar, and 1/2 cup softened butter on medium speed for 2-3 minutes.
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Press firmly into an ungreasedd 13x9x2-inch baking pan.
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Arrange the pecans over the crust.
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Combine 2/3 cup butter and 1/2 cup brown sugar in a heavy saucepan and bring to a boil.
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Boil for one minute, stirring constantly.
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Pour over pecans.
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Bake at 350 degrees for 18-22 minutes or til bubbly.
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Remove from oven, sprinkle with chocolate chips and let stand 3 minutes.
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Spread chocolate, but allow some chips to remain whole.
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Cool completely; cut into squares.