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Preheat oven to 350.
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Butter two round 9 inch cake pans, line bottom with parchment paper and butter again.
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Mix together flour baking powder, soda, and salt - Set aside.
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Beat butter and sugar together until pale and fluffy.
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Beat in vanilla.
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Add eggs one at a time, beating well after each addition.
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With mixer on low, mix in buttermilk until just combined.
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Add flour mixture in three parts, mixing after each addition until just combined.
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Don't over mix!
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Spread batter in pans and rap on pan a time or two to remove bubbles.
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Bake 35 - 40 minutes at 350 (until a toothpick inserted in the center comes out clean).