Ripe plums sprinkled with cinnamon sugar and topped with crunchy walnut and oat crumbs. 2 mins to mix. 20 mins to bake. And your plum crumble is ready!
Wash the plums. Cut them in half and take the seeds out. (You can cut them in quarters or smaller pieces to have them more tender and mushy after baking.)
If you have whole walnuts, chop them finely in a food processor.
When walnuts are finely chopped, add all other ingredients to the food processor: rolled oats, coconut sugar, butter (should be fridge cold, not room temperature), and brown rice flour. Mix thoroughly to get a breadcrumb-like texture.
Scatter the crumble topping evenly over the plums.
Bake for 20 minutes or until the crumble topping turns golden brown. Serve it warm with vanilla ice cream that melts all over it.