Preheat the oven to 400ºF and spray a 9-inch round baking dish with non-stick cooking spray. 

In a large bowl, toss together the sliced plums, vanilla, and fresh ginger. Be sure the plums are covered in fresh ginger before adding other ingredients. 

Add the white whole wheat flour and salt to the plums, toss, and set aside.

Pour the plums into the greased pan and spread them out evenly. Set aside. 

Prepare the topping of the crisp by adding the rolled oats, white whole wheat flour, slivered almonds, brown sugar, honey, ginger, and salt to the bowl and mix the ingredients together. 

Then, add in a stick of softened butter and use a fork (or your hands) to cut the butter into the dry ingredients until it forms little crumbles.

Evenly spread the crumble topping over the plums in the baking dish.

Bake at 400ºF for 40-50 minutes or until the plum filling begins to bubble, the plums are at the desired consistency, and the crumble topping begins to brown.

Remove from the oven and let set for 10 minutes before serving.

Serve with vanilla ice cream or whipped cream.