Preheat oven to 375°F (190°C) and spray a 11 x 7 inch baking dish with non-stick cooking spray. Set aside.
Combine rhubarb, sugar, flour and cinnamon and place in the prepared baking dish.
Combine the topping ingredients and sprinkle over the top of the rhubarb mixture.
Bake for 35 minutes or until the top is golden brown.
Remove the dish from the oven and let it sit for a few minutes before serving.
