In a mixer, combine cake mix and brown sugar. Add
mashed bananas. Stir in oil and sour cream until
blended. Beat in eggs one at a time, mixing well
between additions. Stir in vanilla. Pour cake into
a greased 9 x 13 inch pan. Bake for 30-35 minutes,
or until toothpick inserted in the center comes
out clean. Remove from oven and let cake cool
completely.
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