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Combine flour and baking soda; set aside.
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In a separate bowl, cream butter and sugar.
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Add salt, cinnamon, and vanilla.
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Add sour milk alternately with flour and baking soda mixture.
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Stir in apples.
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Pour batter in greased 9x13 inch pan.
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Combine topping ingredients and sprinkle evenly over cake batter.
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Bake at 350 degrees for 45 minutes.