Cut 12 slices bread into rounds using Cut-N-Seal. Crimp edges by pressing handle; do not twist. Cut ham and cheese into rounds using Cut-N-Seal.
Spread 1 teaspoon mustard on each bread round.
To assemble four triple decker club-wiches, layer one cheese round and ham round on top of four bread rounds. Then top each with a second bread round, cheese round and ham round. Invert remaining bread rounds, mustard side down for top. Cut in half or quarters.