This rhubarb pie with crumble topping is an amazing spring dessert. The sweetened rhubarb is not tart once baked and the brown sugar and oatmeal topping is a perfect pairing. Serve this easy rhubarb pie warm or cold with a scoop of vanilla ice cream for an irresistible treat!
In medium bowl beat sugar, 2 tablespoons flour, egg and vanilla.
Sprinkle crumble topping evenly over rhubarb pie.