Auntie K's Banana Bread

I had some overly ripe, ok they were black, bananas so I decided to do something productive with them and make some banana bread. This recipe is from my Aunt Karen, who is an awesome cook.  It is so moist.  I have found the more ripe the bananas are the better the bread. I got busy and cooked this batch a tad too much!
Banana Bread
1 cup butter
2 1/2 cups sugar
4 eggs
1 cup sour cream
4 cups flour
1 tsp. baking soda
1 tsp. salt
1 tsp. vanilla
4-5 mashed bananas
1/2 cup nuts (optional)

Cream butter and sugar; add eggs, bananas, sour cream and vanilla.  Mix dry ingredients and add to creamed mixture.  Bake at 350 degrees for 50-55 minutes.  Makes 3 loaves.