Preheat Oven to 350 degrees
Combine crust ingredients together (butter, flour and sugar) and press into bottom of a 9X13" pan bake for 10-12 minutes
For filling mix sugar and flour together then gently stir in rhubarb until coated evenly. Beat egg yolks together and gently mix in the half and half. Add egg mixture to rhubarb mix and combine. Pour rhubarb mixture over crust and then bake an additional 45 minutes.
When rhubarb layer is done baking the additional time, beat the egg whites, sugar and baking powder until stiff, spread over baked rhubarb layer and bake an additional 5 minutes or until lightly browned.
Enjoy