I followed the other persons suggestion and ground oats instead of using flour. I also used real butter. I keep frozen blueberries on hand so gathering ingredients was easy. I couldn't wait to get the leftovers out of the fridge the next morning and eat them for breakfast! I am about to make the recipe again because I've been craving it all week. It was that yummy! I bake it in my stoneware 9x9.
I removed the flour and used oat flour (ground up oatmeal) added clove and nutmeg to taste with a stick of butter for the crumb. Very good. Not to sweet and the filling was perfect. Not to sweet, just right