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Heat oven to 350°F.
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In a small bowl, combine all crust ingredients.
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Beat at low speed, scraping bowl often, until mixture is crumbly.
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Press into bottom of 8-inch square baking pan. Bake for 15-20 minutes or until edges are lightly browned.
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Meanwhile, in a small bowl, combine all filling ingredients except powdered sugar.
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Beat on low speed, scraping bowl often, until well mixed.
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Pour filling over hot crust.
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Continue baking for 18-20 minutes or until filling is set.
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Sprinkle with powdered sugar, cool.