Begin by slicing your ripe bananas into thin rounds. In a large mixing bowl, combine the banana slices with granulated sugar, light brown sugar, melted unsalted butter, water, lemon juice, vanilla extract, ground cinnamon, ground nutmeg, and salt. Stir gently to coat the bananas evenly. Allow this mixture to sit for 15-20 minutes, letting the sugars caramelize and enhance the flavors.

While the banana mixture rests, grab another bowl to prepare the cobbler topping. Whisk together all-purpose flour, granulated sugar, baking powder, baking soda, and a pinch of salt. Ensure there are no lumps in the dry ingredients.

In a separate bowl, whisk together the cold buttermilk, the remaining melted butter, and vanilla extract until smooth. Gently fold this wet mixture into the bowl of dry ingredients using a rubber spatula.

Preheat your oven to 375°F (190°C) and prepare a 9x13 inch baking dish by greasing it lightly. Once the oven is heated and the dish is ready, you can move on to layering your Southern Banana Cobbler.

Pour the banana filling mixture into the prepared baking dish, spreading it out evenly. Next, dollop the cobbler batter over the banana mixture, creating a rustic appearance.

Place the assembled Southern Banana Cobbler in the preheated oven and bake for 35-45 minutes. Look for a golden-brown crust on top.

After baking, remove the cobbler from the oven and allow it to cool for 15-20 minutes before serving. Dish out warm slices of the Southern Banana Cobbler and accompany each serving with whipped cream or ice cream.