Heat a heavy skillet to medium-high heat. Butter one side of each slice of bread. Dry toast the unbuttered side, flip until the other side is golden brown. Remove from heat.
Cut vegan deli slices, and cheeses into strips.
Spray pan with cooking oil. Sautée peppers and onions until tender. Add deli slices, and spices and continue to sautée.
Add the strips of cheese to the mixture and top the pan with a lid to use the steam from the food to melt the cheese.
After about five minutes, remove the lid and continue to stir the mixture until the cheese is evenly distributed for another two minutes.
Top the toasted bread with the sautéed mixture and serve with mustard, pickles, tomatoes, and lettuce.