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Cream butter sugar and vanilla until light and fluffy
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Add the eggs, one at a time and beat well.
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Sift together the flour, baking powder, baking soda (and coconut if you are using it)
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Add dry ingredients to the creamed mixture, folding to combine well.
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Fold in the 1/2 cup dark and 1/2 cup white chocolate chips.
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Spread in a greased 9 inch square baking pan and bake for 40-45 minutes at 350 degrees F. (325 for glass bake ware)
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Remove from oven and while still hot, sprinkle evenly over the top with the additional dark and white chocolate chips. Let stand for 5 minutes, then spread the melted chips evenly over the surface with the back of a spoon or an offset spatula.
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Cool thoroughly before cutting into squares or bars.