Heat oven to 350. Grase 9x13 pan
In large bowl, stir all cookie base ingredients until soft dough forms. Press dough in bottom of pan. Bake 15 - 18 minutes or until golden brown. Cool completely, about 1 hour.
In small bowl, beat all filling ingredients on medium speed until smooth. Spread mixture evenly over cookie base.
In microwaveable bowl, microwave all frosting ingredients on high for 30 seconds; stir until smooth. Cool 10 minutes; spread over filling. Refrigerate 30 minutes or until set. Cut into bars
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