Combine Fruit Filling ingredients in a large bowl. Place this rhubarb mixture in a buttered enamel cast rectangular baker.
Combine Topping ingredients in a large bowl. Make sure the butter is evenly distributed. Spread evenly on top of the rhubarb mixture.
Bake in a preheated oven at 375°F for 45 minutes to 1 hr.
Optional: Delicious with vanilla ice cream.
Recipe was created for our Calphalon Enamel Cast Rectangular Baker.