Prep time: 5 minutes
Cook time: 15 minutes @ 150* F
Yields: How ever many you want to make
Mix together 1 part softened butter with 1 part mustard. Add in finely chopped onions.
Spread mixture on both cut sides of buns.
Place ham and cheese inside.
Wrap in foil.
Bake at 250* F for about 15 minutes.
These may be made ahead and frozen for up to 4-6 weeks. Bake frozen sandwiches about 25 minutes.