Instructions: In a large bowl, combine all-purpose flour, whole wheat flour, oat bran, baking soda, and brown sugar. Add margarine and oats, and cream until crumbly. Spread half of mixture in greased 7- by 10-inch pan. Arrange apple slices over it. Dot margarine on apples. Sprinkle sugar on top. Cover with remaining mixture. Bake 40 minutes. Cut into 2- by 2-inch squares while warm.

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