Heat about 1/2 tablespoon of butter on medium heat.

Add the chopped onions and cook until the onions soften and become translucent.

Add the chopped tomatoes and cook until the tomatoes soften.  Set aside.

Heat another 1/2 a tablespoon of butter.

Set two slices of bread to the pan.  Cook just until the beat begins to toast.  You want the inside of the sandwich to withstand the fillings and not get soggy.  Flip the bread over.

Add a slice of Hot Pepper Jack Cheese to one slice of bread, and two slices of White Cheddar Cheese to the other slice of bread.  Lower the heat to low-medium.

Next, add about a tablespoon of the spicy mayo to each slice.

Scoop about a tablespoon of the onion and tomato mixture and add it to the slice of bread with the Hot Pepper Jack Cheese.

Add the turkey (or chicken) to the slice of bread with the Hot Pepper Jack Cheese.   You may want to cover the pan for a few seconds to encourage the cheese to melt quicker.

Sandwich the bread with the White Cheddar Cheese to top the slice of bread with the turkey.