Warm a skillet over medium heat for 3-5 minutes. Layer each sandwich as follows: Slice of bread, buttered side down, mustard side up, 1/2 cup shredded sharp cheddar cheese (or 2 slices), 1 small alfalfa sprouts, 4 slices red onion, 2 tomato slices, 2 slices turkey, 1/2 cup shredded sharp cheddar cheese (or 2 slices) and slice of bread, mustard side down, butter side up.