Preheat oven to 160c. Grease an 8 inch cake pan.

Combine flour, salt, baking powder, baking soda and sugar in a large bowl.

In a separate bowl, beat eggs. Add melted butter, sour cream, mashed banana and vanilla.

Stir with a spoon till well combined.

Make a well in the centre of the flour mixture. Pour the wet ingredients into it and mix with a spoon till thoroughly combined.

Spoon the mixture into the prepared pan and bake for an hour until risen and golden brown.