Preheat overn to 325 degrees. Cream butter and shortening together. Gradually add sugar and beat well. Add eggs, one at a time, beating well after each addtiion.
Using a spoon, add flour to creamed mixture alternately with flour. Stir in vanilla; beat well, Pour batter into well-greased Bundt pan. Bake for 90 minutes. Cool 10 minutes before inverting onto a serving plate. Glaze or drizzle with icing if desired.
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