Remove rolls from the tray and slice the whole tray of rolls lengthwise.

Spread butter on the bottom layer.

Spread a thin layer of mustard on top of the butter.

Lightly sprinkle the green onions and the poppy seeds on the bottom layer.

Layer ham slices to cover the bread. Follow with a layer of swiss cheese, one more layer of ham, and then one more layer of swiss cheese.

Prepare the top layer of bread like you did the bottom layer and place the top layer back on the sandwiches.

Wrap the entire large sandwich in foil.

Bake at 350 for 20 minutes or until the cheese is melting.

Remove from the oven and cut each sandwich roll with a sharp knife.