Mix as for pie crust ... at 350 degrees, cool completely. 1 c. powdered sugar ... 1 cup Cool Whip. Then spread on cooled ... on top. Keep refrigerated.
Melt butter; add flour, walnuts ... for 15-20 minutes. Cool completely. Second layer: Mix together Cool Whip and miniature marshmallows. Spread over ... filling. Refrigerate and serve.