Cream butter and sugar until light. Add eggs, one at a time, beating well between additions.

Sift flour with baking powder, bicarbonate of soda, salt and cinnamon.

Add flour mixture to creamed mixture alternatively with bananas, beating well until smooth. Stir in extras (optional) and vanilla extract.

Pour into a lined and buttered 8 inch loaf tin. Smooth top and bake at 180°C (350°F) in centre of oven for 50 minutes to 1 hour. Turn out, remove paper and cool.

Serve sliced and buttered.