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In a bowl, beat butter at medium speed with an electric mixer until creamy.
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Gradually add in sugars, beating until light and fluffy.
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Add eggs, 1 at a time, beating on low speed just until blended after each addition.
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In another bowl, stir together buttermilk and baking soda.
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Combine flour and salt; add to butter mixture alternately with buttermilk mixture, beginning and ending with flour mixture.
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Beat at low speed after each addition just until blended; stir in vanilla.
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Spray five 5 ¾ x 3 ¼ inch disposable foil loaf pans with cooking spray.
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Pour batter evenly into pans (about 1 cup batter per pan).
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Bake in a preheated 325° oven for 50-55 minutes or until a pick comes out clean.
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Cool cakes in pans on wire racks for 10 minutes.
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Remove from pans, and cool completely on wire racks.