Preheat the oven to 175°C (350°F). Grease and flour an 8-inch round cake pan.
In a medium bowl, whisk together the all-purpose flour, baking soda, baking powder, and salt. Set aside.
In a large bowl, combine the mashed bananas, granulated sugar, and vegetable oil. Mix well until smooth.
Add the eggs one at a time to the banana mixture, beating well after each addition.
Stir in the vanilla extract and buttermilk until fully incorporated.
Gradually add the dry ingredients to the wet ingredients, mixing gently until just combined. Do not overmix.
Fold in the melted unsalted butter to the batter.
Pour the batter into the prepared cake pan and smooth the top with a spatula.
Bake in the preheated oven for 35 to 40 minutes, or until a toothpick inserted into the center comes out clean.
Remove the cake from the oven and brush the top with honey while still warm to add a subtle glaze and shine.
Allow the cake to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before serving.