In a food processor pulse the butter, brown sugar and flour until mixture forms small, pea sized crumbs.
Add cinnamon and oats and give a quick pulse.
Place half the oat mixture in a lightly greased 9x13" baking dish. Press mixture down with the back of a spoon.
Pour applesauce on top of oat mixture and spread evenly over oat mixture.
Sprinkle remaining oat mixture over applesauce and press down into applesauce gently.
Bake in a preheated 350 degree oven for 40 minutes. 20 minutes into cooking press mixture back down into applesauce to make sure it all gets incorporated.
Allow to fully cool before slicing.