Preheat your oven to 350°F (180°C) and line a muffin tin with paper liners.
In a bowl, mash the bananas with a fork until you have a smooth purée.
In another bowl, whisk together the flour, baking powder, cinnamon (if using), and salt.
In a large bowl, cream together the eggs and sugar until light and fluffy. Then, add the melted butter and vanilla extract.
Gradually add the banana purée and milk to the egg mixture.
Gently fold the dry ingredients into the banana mixture, mixing until just combined. Do not overmix.
Fill the muffin liners about ¾ full with batter.
Bake the cupcakes for 18-20 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Let the cupcakes cool completely. Dust with powdered sugar or frost as desired.
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