Mix 1 cup all purpose flour, 1/2 teaspoon baking soda, 2/3 cup brown sugar and 1 1/4 cups oatmeal. Cut in 1/2 cup butter. Spread half the mixture in a greased 8" square pan. Arrange a layer of 2 cups sliced apples over crumb mixture. Dot with 2 tablespoons butter and sprinkle with 1/4 cup granulated sugar. Cover with remaining crumb mixture. Bake 45 minutes in 350 degree oven. Cut in bars or squares. Serve warm with a tart lemon sauce if desired.