Created by Derf on July 10, 2013
Step 1: Preheat oven to 350f degrees.
Step 2: Filling:
Step 3: In a saucepan, bring blueberries, sugar and orange juice to a boil, reduce heat and simmer until tender, about 10 minutes. Whisk cornstarch with 2 tablespoons water; whisk into blueberries and boil, stirring until thickened, about 1 minute. Place plastic wrap directly on surface, refrigerate until cool, about 1 hour.
Step 4: In a large bowl, whisk together oats, flour, sugar, orange rind and salt; with a pastry blender cut in the butter until coarse crumbs. Press half into an 8 inch square parchment paper lined metal cake pan; spread with blueberry filling. Sprinkle with remaining oat mixture, pressing lightly.
Step 5: Bake in centre of 350f degree oven until light golden, about 45 minutes. Let cool on rack before cutting into squares.