01 -
Set oven to 350°F (175°C). Grease a 9x9-inch baking dish with butter or nonstick spray.
02 -
Melt 1 tablespoon unsalted butter in a large skillet over medium heat. Add sliced bananas and cook 3-4 minutes until softened and starting to caramelize.
03 -
Stir in brown sugar, vanilla extract, cinnamon, nutmeg, and salt. Cook an additional 2-3 minutes until sugar dissolves and mixture is syrupy.
04 -
If using, carefully add dark rum and cook 1-2 minutes to burn off alcohol. Stir well and let filling bubble slightly before removing from heat.
05 -
Pour warm banana filling evenly into prepared baking dish.
06 -
In a medium bowl, whisk together all-purpose flour, baking powder, granulated sugar, and salt.
07 -
Add cold cubed butter to dry ingredients. Using a pastry cutter or fingers, blend until mixture resembles coarse crumbs with pea-sized bits.
08 -
Stir in buttermilk and vanilla extract until dough just comes together. Avoid overmixing; the dough should be slightly sticky but firm.
09 -
Spoon cobbler topping evenly over banana filling, leaving some filling exposed if necessary.
10 -
Bake in preheated oven for 25-30 minutes until topping is golden brown and a toothpick inserted in topping comes out clean.
11 -
Let the cobbler rest 5-10 minutes to thicken before serving warm.