Preheat oven to 180 degrees. Grease a small loaf pan well.
Beat the butter and sugar till fluffy. Add the egg and beat till incorporated.
Sift the flour, baking powder and baking soda into the butter mixture. Add the milk and fold in the mixture.
Fold in the mango slices and cardamom till done.
Pour into the prepared pan and bake for 30 minutes or till done.