Preheat your oven to 350°F (180°C) and line a muffin tin with paper liners.
In a large bowl, whisk together the flour, baking powder, and salt.
In another bowl, mash the bananas with a fork, then stir in the lemon juice and lemon zest.
Melt the butter and let it cool slightly.
In a separate bowl, whisk the eggs with the granulated sugar and vanilla sugar until light and fluffy.
Add the melted butter and milk to the egg mixture, then stir until smooth.
Gradually add the dry ingredients to the wet ingredients, and finally, gently fold in the mashed bananas. Be careful not to overmix, to keep the muffins light and tender.
Evenly distribute the batter into the muffin liners, filling each about three-quarters full.
Bake the muffins for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Let the muffins cool in the tin for 5 minutes, then transfer them to a wire rack to cool completely.
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