Preheat your oven to 350°F (180°C) while preparing the batter.
In a large bowl, whisk together the flour, sugar, baking powder, salt, and vanilla sugar.
In another bowl, mash the ripe bananas until smooth. Add the eggs, oil, and milk, then mix well to combine.
Gradually add the wet ingredients to the dry ingredients, mixing until just combined. Do not overmix.
Divide the batter evenly among muffin liners, filling each about 2/3 full.
Place a teaspoon of caramel sauce in the center of each cupcake, then cover with the remaining batter.
Bake the cupcakes for 20-25 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Let the cupcakes cool completely before frosting.
Whip the heavy cream until stiff peaks form. Gradually add the powdered sugar and a drizzle of caramel sauce, creating a silky caramel frosting.
Pipe or spoon the frosting onto the cooled cupcakes. Drizzle with extra caramel sauce and garnish with banana slices, if desired.
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