The blueberry bar cookie recipe is reminiscent of a cobbler, with its crumbly oats topping!   Ingredients 1 1/2 cups quick-cooking rolled oats 1 cup all-purpose flour 3/4 packed brown sugar 1 1/2 sticks (3/4 cup) salted butter 1 cup frozen blueberry preserves 1 teaspoon ground lemon peel Hardware Whisk Medium bowl Small bowl 8x8x2-inch […]