Preheat oven to 375 degrees Fahrenheit.I
In a bowl, mix together all the topping ingredients. Use your fingers to work in the butter until it is evenly distributed.
In another bowl, mix all the filling ingredients and pour it into an oven safe dish. I used my 6 cup souffle mold which fit perfectly.
Top with oat topping and gently pressing down.
Bake crumble for 45 minutes until the top begins to turn golden brown. (Note: Keep an eye on it during the last 15 minutes, if it's turning brown too quickly, cover with foil and continue baking).
While the crumble bakes, make the coconut whipped cream. Open the can of coconut milk and pour out the water. (Save for smoothies, soups, etc).
Pour the thick coconut milk into a the bowl of a stand mixer (or into a bowl if using a hand mixer) and begin to whip, starting on low speed and gradually moving to medium-high setting.
As soon as the cream begins to thicken, add powdered sugar and continue to beat. Check every so often for desired consistency.
Allow crumble to cool for at least 15 minutes and top with coconut whipped cream for serving.