Heat oven to 350 degr. Mix flour, butter and powdered sugar. Press in ungreased square pan, 8x8x2, or 9x9, building up 1/2 inch edges. Bake 20 minutes. Beat remaining ingredients until light and fluffy, about 3 minutes. Pour over hot crust. Bake until no indentation remains when touched lightly in center, about 25 minutes. Cool; cut into about 1 1/2 inch squares.
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