Caramelize the banana halves on a griddle with a little butter and sugar.
Mash the caramelized bananas and mix with the sour cream, rum, and vanilla.
In a separate bowl, whisk together the flour, malted milk powder, baking powder, baking soda, and salt.
In another bowl, whisk the granulated sugar, brown sugar, and eggs until smooth, then stir in the melted butter.
Alternate adding the dry and wet ingredients to the egg mixture, mixing just until combined.
Pour the batter into a parchment-lined loaf pan and bake at 350°F until a toothpick inserted comes out clean.
Slice the baked banana bread and griddle the slices in butter until golden brown on both sides.
Serve the griddled banana bread with a dollop of malted whipped cream.
