Looking for another great way to use frozen blueberries and rhubarb? Make an easy blueberry rhubarb crisp recipe with frozen or fresh blueberries and rhubarb baked with a delicious oatmeal brown sugar topping.
Rinse the blueberries in a colander and let drain.
If you are using fresh rhubarb, rinse and slice the rhubarb stalks into bite-sized chunks. If you are using frozen rhubarb, the fruit should already be in chunks.
In an 8-inch square baking dish, mix the blueberries and rhubarb with flour and sugar.
In a medium-sized microwave-safe mixing bowl, melt the butter or margarine in the microwave for about 45 seconds.
After the butter is melted, add the brown sugar, flour, oatmeal, and cinnamon to the bowl and mix.
When the topping mixture is combined, distribute evenly over the top of the blueberries and rhubarb in the baking dish.