Mash bananas in a large bowl. Add the cereal, milk, egg, oil, brown sugar, and almond extract.
Stir the cereal mixture again and add the flour, baking powder, and salt. Stir just until combined.
Divide the banana bran muffin batter into a muffin pan, you should get 12 muffins. Sprinkle sliced almonds on top of the batter.