In a large bowl combine 1 1/2 cups uncooked quick cooking oatmeal, 1 1/2 cups all purpose flour, 1 cup firmly packed light brown sugar, 1/2 teaspoon baking soda and 3/4 cup melted butter. Press 2/3 of mixture into 9" square pan. Over crumbs, pour 1 can (21 oz.) blueberry pie filling. Top with remaining crumbs. Bake at 350 degrees for 30 to 35 minutes. Cool and cut into 9 squares.