1 (3 ounce) package yellow cake mix
1/3 cup water
3 tablespoons butter
1 cup brown sugar
1 egg
1/4 teaspoon vanilla extract
Preheat oven to 375 degrees F (190 degrees C). Grease and flour two 9x5 inch loaf pans.
In a large bowl, mix together cake mix, water, butter, brown sugar, egg, and vanilla extract. Beat until well blended. Pour batter into prepared pans.
Bake in preheated oven for 30 to 35 minutes, or until a toothpick inserted into center of the loaf comes out clean.