Preheat oven to 275 F​
 

Mix dry ingredients together and set aside
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Cream butter & sugar together until light and fluffy add eggs one at a time, and vanilla and mix with beaters add dry ingredients and kefir and mix well
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Stir in mashed bananas and raisins, if used.​
 

Put in greased pan and bake at 275 degrees for approximately 1 hour. It is done when toothpick inserted into center of cake comes away clean.
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Enjoy. You may wish to eat it with some blueberries or strawberries. 
 

Yummy!