01 - Preheat oven to 350°F. Grease an 8-inch square baking dish with butter or non-stick spray.
02 - Melt 2 tablespoons of butter in a large skillet over medium heat. Add sliced bananas, granulated sugar, brown sugar, cinnamon, nutmeg, vanilla extract, lemon juice, and a pinch of salt. Cook for 3 to 5 minutes, stirring gently, until bananas soften and the mixture becomes syrupy. Remove from heat and spread evenly across the bottom of the prepared baking dish.
03 - In a mixing bowl, whisk together the flour, granulated sugar, baking powder, and salt. Pour in the milk, melted butter, and vanilla extract, stirring until just combined. Avoid overmixing to keep the topping tender.
04 - Drop spoonfuls of batter over the banana filling, spreading gently with a spatula. Leave some gaps exposed to allow steam to escape and create a rustic, golden crust.
05 - Bake for 35 to 40 minutes until the topping is golden brown and a toothpick inserted into the crust comes out clean.
06 - Allow the cobbler to cool for 10 to 15 minutes. Serve warm, topped with vanilla ice cream or whipped cream if desired.