Warm a skillet over medium heat for 3 to 5 minutes. Layer each sandwich as follows: Slice of bread, butter side down, ½ cup shredded provolone cheese (or 2 slices), 3 slices ham, 4 slices salami, 2 tomato slices, ½ of the avocado slices, ½ cup shredded colby-jack cheese (or 2 slices) and slice of bread, butter side up.