Preheat the broiler and place a rack about 8 inches beneath it.
Slice the bread lengthwise into strips about 2 inches wide.
Cover a baking sheet with nonstick foil.
Spread some butter or margarine onto one side of one bread strip and place it butter-side down onto the foil.
Lay the cheese over the bread so that it sticks out about 1 inch on each side of the bread strip. Top with another strip of bread and spread butter on the top. Repeat with additional bread and cheese.
Place baking sheet under the broiler for approximately 5 minutes, or until the bread is toasted to your desired level (keep an eye on it because the bread will toast quickly!).
Remove the baking sheet to a heat-proof surface and flip each "sandwich" over with a spatula. (This will be messy, but it's OK! The more cheese gets all over the bread, the better.)
Return to the oven and broil for several more minutes or until bread is evenly browned.
Serve immediately, paired with your favorite soup.