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Preheat oven to 350ºF.
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Prepare a 9x13 inch baking pan by spraying it with nonstick cooking spray.
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In the bowl of a stand mixer with the flat beater attached, thoroughly cream together butter and sugars.
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Add the eggs, one at a time, beating well after each addition.
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In a separate bowl, sift together flour, salt and baking powder.
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With the mixer running on LOW, gradually add the flour mixture to the butter mixture.
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Pour the batter evenly into the prepared pan, spreading out well.
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Spoon raspberry preserves on top of the batter.
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Sprinkle the white chocolate chips evenly around the top.
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Bake for 30-35 minute.
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Let cool before cutting into bars.