🥪Lay out the two slices of whole-grain bread on a clean surface.
Spread mayonnaise on one slice and Dijon mustard on the other, if using.
Place 4 slices of turkey breast evenly on top of the mayonnaise side.
Layer 2 slices of Swiss cheese over the turkey.
Add lettuce leaves and tomato slices if desired, then season with salt and pepper.
Top with the second slice of bread, mustard side down.
Preheat a skillet over medium heat.
Toast the sandwich in the skillet for 2-3 minutes per side, until the bread is golden brown and the cheese is melted.
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