Preheat oven to 180C.
Place all ingredients in a blender and blend until combined and the oats have broken down. The mixture should be the consistency of regular pancake batter.
Pour pancake mixture into a large oven-proof saucepan.
Arrange plums on pancake as desired.
Bake for around 30 minutes or until the centre is cooked.
Let pancake rest for 5 minutes then serve warm with maple syrup!