Created by KittenCal on November 2, 2011
Step 1: Grease a 7 x 11-inch baking pan, then line bottom with a sheet of parchment paper; set aside.
Step 2: In a food processor, put the flour, oatmeal, brown sugar, baking powder, salt and cinnamon; pulse to blend for 20 seconds.
Step 3: Add in the cold butter chunks, and pulse to cut in the butter into the dry ingredients until you have a crumbly mass (not dry, but not sticking together).
Step 4: In a bowl toss the blueberries with lemon juice, then mix in the sugar and cornstarch.
Step 5: Spread half of the oatmeal mixture on the bottom of the pan then pat down gently using your hands
Step 6: Top with the blueberry mixture as evenly as you can, then top with the remaining oatmeal mixture, and press down slightly.
Step 7: Chill the pan for about 45 minutes.
Step 8: Preheat oven to 350 degrees F, then bake for 30-40 minutes, or until the fruit starts to bubble.
Step 9: Cool pan very well before cutting, or refrigerate for 2-3 hours before cutting into squares (once sliced it will appear watery but will thicken upon standing and/or chilling)