Preheat your oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish with butter or nonstick spray.

In a large mixing bowl, combine sliced ripe bananas with granulated sugar, melted butter, vanilla extract, ground cinnamon, and salt; gently fold until bananas are coated.

In another bowl, whisk together self-rising flour, whole milk, and sugar until just combined; add ground nutmeg if desired.

Pour the batter into the greased baking dish, spreading it evenly; dollop the banana filling over the top without stirring.

Bake in the preheated oven for 45–50 minutes until golden brown and bubbly at the edges.

Let the cobbler rest for 10 minutes before serving warm, ideally topped with ice cream or whipped cream.