Lightly grease one microwave safe mug. Line mug with half of the bread cubes. Circle the inside of the cup with bread, then fill the middle. Continue to stack up until you run out, so that it forms a tower of bread inside the mug.
In a separate mug or small bowl, whisk egg, milk, cinnamon, pumpkin and sugar.
Pour half of mixture onto bread tower, making sure custard mixture touches all bread pieces. Microwave for about 1 minute or until custard is fully cooked.
Remove from mug and place onto a plate. Use mug again to make second bread pudding.
