Instructions
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Mix sugar substitute ,cornstarch, rhubarb, and water, and cook until thick
Add vanilla
Mix flour, maple sugar, stevia, soda, butter, and nuts until crumbly
Pat about 2/3 of crumb mixture in 9"x13" pan
Pour the cooked rhubarb over layer of crumb
Top with remaining crumbs
Bake 30 to 35 minutes at 375 degrees
Let cool completely before cutting into squares or rectangular bars