INGREDIENTS
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1/2 cup vegetable shortening
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1/4 cup butter
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1/4 cup sour cream
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1/2 cup granulated sugar
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1/2 cup brown sugar
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1/2 teaspoon salt
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1 teaspoon baking powder
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1 teaspoon vanilla extract
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1 egg
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2 + 1/2 cup unbleached all-purpose flour
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1/2 cup cornstarch
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about 3/4 cup strawberry or seedless raspberry jam
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confectioners' sugar for sprinkling over top