Preheat Oven: Preheat oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper.
Mash Bananas: In a large bowl, mash the ripe bananas with a fork until smooth.
Mix Wet Ingredients: Stir in melted butter, sugar, egg, and vanilla extract until well combined.
Add Dry Ingredients: Gently fold in flour, baking soda, salt, cinnamon, and nutmeg. Avoid overmixing.
Optional Add-ins: Fold in nuts or chocolate chips if using.
Bake: Pour batter into the prepared loaf pan. Bake for 50-60 minutes, or until a toothpick inserted comes out clean.
Cool: Let it cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Serve: Slice and enjoy warm or at room temperature!