Prepare Butter Mixture: In a small bowl, combine softened butter, grated parmesan cheese, and garlic powder until well blended. Spread a layer on the outside of each slice of bread. Set aside.

Assemble Sandwich: Layer one slice of bread with cheese, turkey cold cuts, followed by another slice of cheese. Top with a second slice of bread, buttered side up.

Toast the Sandwich: Heat a nonstick skillet over low heat. Toast the sandwich for 5-6 minutes until golden brown, flip and repeat.

Make the Dressing: Whisk together mayonnaise, red grape juice vinegar, remaining parmesan, garlic powder, Italian seasoning, and cracked pepper until smooth. Set aside.

Add Fresh Toppings: Toss together lettuce, red onions, and banana peppers with the dressing. Layer on the grilled cheese once toasted.

Serve: Slice the sandwich in half and serve promptly with a side salad or tomato soup.