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In large bowl, whip eggs and sugar until creamy.
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Blend in 1 tsp each of baking soda, baking powder, and vanilla.
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Add 1 cup oil and 1/2 cup buttermilk, mixing well.
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Add 5 cups flour, stirring well after each cup. Do not overmix, or dough will get tough.
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Roll dough 1/4 in thick and drape over pie tin, leaving 2" flopping over edge of pan.
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Note: If adding a pre-cooked filling, pick up flaps of dough and pull back over filling to creat a 1" collar around outer edge of pie. (No top crust needed; latticework optional).
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Bake at 375 - 400 degrees until crust is deeply golden. Time will vary based on whether crust is filled or not.