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Preheat oven to 350 degrees F.
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Spray a 13 X 9 baking pan evenly with non-stick cooking spray.
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Beat 1 cup brown sugar with 1/2 cup melted butter with an electric mixer on medium for 2-3 minutes.
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Add the flour mixture and mix until smooth.
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Press the flour mixture evenly and firmly into the prepared baking pan.
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Sprinkle the pecans evenly oven the flour mixture in the pan.
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Mix the 2/3 cup butter and 1/2 cup brown sugar in a saucepan and bring to a boil over a medium heat.
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Stir constantly while boiling for about 1 minute.
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Spread the boiling mixture evenly over the pecans.
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Bake for about 20 minutes.
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Cool.
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Melt the chocolate chips in the microwave, stirring ever 30 seconds or so until almost smooth (you can do this in a double boiler on the stove if you prefer).
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Remove the chocolate chips, stir thoroughly to smooth and spread evenly over the top of the squares.
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Chill for 15 minutes until the chocolate sets and then remove from fridge.
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When squares have returned to room temperature (so chocolate won't crack) cut into 36 squares.