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Preheat the oven to 350°F and spray a 9- inch square pan with nonstick cooking spray.
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Combine all the ingredients for the crust in a medium bowl and stir with a wooden spoon until a soft dough forms.
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Press evenly into the prepared pan.
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Chill for 10 minutes.
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Bake the crust for 15 minutes, then let cool in the baking pan for 15 minutes.
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Combine all the ingredients for the lemon topping in a bowl and whisk until blended.
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Spread the raspberry preserved evenly over the baked crust.
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Pour the lemon topping over the raspberry layer.
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Place in the preheated oven and bake for 20-25 minutes.
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Lower the oven temperature to 325°F and bake for 20-25 minutes longer, or until the topping is set.
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Transfer the pan to a wire rack and let cool completely.
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Refrigerate for at least 1 1/2 hours before cutting.
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Store at room temperature, or in the refrigerator if you prefer chilled squares.