Spray pan with oil
Make the crumble by mixing dry ingredients and then cutting in the butter with a pastry cutter.
On an oiled pan put 3/4 of the crumble mixture into the bottom of an 8 * 8 square pan
Put the berry chia jam filling over the crumble bottom
Put the rest of the crumble mixture on top and bake it at 350 for 40 minutes.