1 lb. canned cooked ham sliced thin
1 lb. Swiss cheese, sliced thin
1/4 c. butter, softened
2 tbsp. chopped onion
2 tbsp. Dijon mustard
2 tsp. poppy seeds
16 hamburger buns

Mix butter, onion, mustard, poppy seeds to make a spread.

Spread on buns and layer ham and cheese on. Wrap each sandwich in foil and bake 15 minutes at 325 degrees.