Turn the oven on in the grill function to preheat to a high temperature.
Put the slices of bread on a baking sheet, put under the grill, fry the bread for 1.5 minutes on each side. Grease each slice of bread with 2 teaspoons of mustard, top with 2 slices of bacon, 3 slices of tomato, and add 3 tablespoons of chopped cheese. Place the bread slices under the grill and grill for about 3 minutes, until the cheese melts.