Preheat a skillet or griddle over medium heat.
Butter one side of each slice of bread.
Place two slices of bread, buttered side down, on a clean surface.
Divide the cooked chicken evenly between the two slices of bread, then spoon marinara sauce over the chicken.
Sprinkle shredded mozzarella and grated Parmesan cheese over the sauce.
Add garlic powder, dried basil, dried oregano, salt, and pepper.
Top each sandwich with the remaining slices of bread, buttered side up.
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