Preheat your oven to 350°F (175°C) and grease a loaf pan with butter or non-stick spray.

In a mixing bowl, combine the sugar, brown sugar, and softened butter. Cream together with an electric mixer until light and fluffy.

Mash the ripe bananas in a separate bowl until smooth, then add them along with the eggs to the creamed mixture. Mix until well combined.

Sift together the flour, baking soda, cinnamon, nutmeg, and salt in a separate bowl. Gradually fold the dry mixture into the wet batter.

Pour the batter into the prepared loaf pan, smoothing the top.

Bake in the preheated oven for 50 to 60 minutes, until golden brown and a toothpick comes out clean.

Cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely before slicing.