1 tablespoon mayonnaise
2 slices thick-cut rye bread
2 slices Swiss cheese
2 slices leftover turkey meat, or to taste
1/4 cup baby spinach, or to taste
Set oven rack about 6 inches from the heat source and preheat the oven’s broiler.Spread mayonnaise onto 1 side of each bread slice. Layer Swiss cheese, turkey, and spinach onto the mayonnaise-side of 1 bread slice; top with second bread slice. Place sandwich on a baking sheet.
Broil in the preheated oven until heated through and cheese is bubbling, about 5 minutes.