Heat oven to 375°F (170°C). Thoroughly whisk eggs and sugar in a large bowl.
Add baking soda and flour gradually. Mix thoroughly. Bake about 45 minutes or until golden brown.
Let it cool. Then cut a cake into two or three even layers.
Whisk sour cream and sugar in a bowl. Cover with mixture each layer of cake and top with banana slices. Optionally garnish the top of cake with crushed nuts.
Leave the cake in the refrigerator for one hour.
This banana cake great with cups of hot tea. Enjoy your meal!!!