Roast or toast the bread slices both side in butter in a skillet. i.e. melt butter in a iron skillet. Place the bread slice once its roasted on this side flip to next side and roast that side.
In a non-stick pan place a slice of toasted bread slice. Now place some onion, carrot, capsicum such that it cover the bread slice. Now sprinkle cheese over it. Cover this a lid and cook in medium low heat until the cheese is melted. then serve Cook rest of the bread slices the same way and serve.