1. Halve each French loaf horizontally while slicing and then slice them crosswise in thirds. Butter the slices of bread.
2. Take a bowl and combine shredded cheddar cheese, chopped salami, mayonnaise, onion, olives, and prepared mustard. Spoon the filling on bread and take a paper towel and neatly wrap each sandwich bun into it and microwave it for about 2 ½ -3 minutes at high. 3 of such sandwich buns can be heated a t a time.