Preheat oven to 350°F (175°C).

Cream together sugar and butter until light and fluffy using an electric beater.

Add mashed bananas and eggs, beating until well mixed.

Sift together flour, baking powder, salt, and cinnamon in a separate bowl.

Gradually blend the dry ingredients with the banana mixture, being careful not to overmix.

Pour batter into two lightly greased loaf pans.

Bake for 45 minutes to 1 hour, or until a toothpick inserted into the center comes out clean and the edges begin to separate from the pans.

Cool in the pans on a wire rack for 10 minutes before removing.

Transfer to the wire rack to cool completely before slicing.

Optionally, freeze the cooled bread for longer storage.