Preheat your oven to 350°F (175°C). Grease an 8.5-by-4.5-inch loaf pan generously with nonstick cooking spray.

In a light-colored sauté pan over medium heat, add the stick of unsalted butter and stir until it turns golden brown.

Mash 2-3 ripe bananas until smooth, then whisk in the eggs until fully combined.

In another bowl, whisk together all-purpose flour, dark brown sugar, baking powder, cinnamon, salt, and nutmeg.

Combine banana mixture with dry ingredients, then fold in the melted brown butter.

Pour the batter into the loaf pan, smoothing the top, and decorate with halved bananas and brown sugar.

Bake for 70 to 80 minutes, or until a toothpick inserted comes out clean.

Let the bread cool in the pan for 15 minutes, then transfer to a wire rack to cool completely.