FILLING – 6 large plums, mine weighed 2.2 pound – 1/4 cup sugar* – seeds of one vanilla bean or 1 tsp vanilla extract – 1 1/2 Tbsp Instant Clearjel, or 2 Tbsp cornstarch CRUMBLE – 1/2 cup flour – 1/2 cup oat flour, you can also use rolled oats, or grind rolled oats in your food processor or high speed blender to make oat flour – 1/2 cup lightly packed brown sugar – 4 Tbsp room temperature butter – 1 tsp almond extract