This vintage recipe for plum crunch combines the rich flavor of fresh plums with the warm spice of cinnamon and the nuttiness of an oatmeal-based topping.
Preheat the oven to 400 degrees. Grease an eight-by-eight-inch baking dish with butter, and set it aside.
Add the plums sugar, cinnamon, butter and flour in a bowl and stir to combine well.
In another bowl, add the quick oats, brown sugar, flour and cinnamon, and mix to combine. Cut in the butter with a fork or pastry cutter until it is mixed throughout the crunch mixture.
Press half the crunch mixture into the bottom of the prepared pan, and then spread the filling mixture over top. Sprinkle the rest of the crunch mixture evenly over the top.
Bake for 30 minutes or until the filling is bubbling around the edges and the top is browned nicely.
Serve warm or room temperature. Store leftovers in an airtight container.