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Preheat oven to 350°F
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Grease 13 x 9-inch baking pan.
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Combine flour, sugar and walnuts in large bowl.
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Cut in butter and egg with pastry blender or two knives until mixture is crumbly.
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Reserve 1 1/2 cups of the crumb mixture.
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Press remaining crumb mixture into prepared pan.
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Spread marmalade evenly over crumb mixture in pan, leaving 1/2-inch border.
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Sprinkle white morsels and semi-sweet morsels evenly over the marmalade.
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Sprinkle reserved crumb mixture evenly over the chips.
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Bake for 45 to 50 minutes or until top is light brown.
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Cool completely in pan on wire rack.
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Cut into bars.