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sugar - more or less to taste
Cut the butter into the flour and powdered sugar until crumbs form. Pat into the bottom of a 9x13 pan and up the sides a little.
Bake at 350* for 15 minutes
For topping, thoroughly beat all ingredients EXCEPT rhubarb and nuts.
Fold in rhubarb and nuts.
Pour over baked crust and bake an additional 35 minutes.