Spread a generous layer of butter on one side of each slice of bread. Sprinkle garlic powder and Italian seasoning on the buttered side.

Flip two slices of bread buttered-side down. Spread marinara or pizza sauce on the inner sides. Layer shredded mozzarella, grated Parmesan, and turkey pepperoni or veggies. Top with remaining slices, buttered sides facing up.

Preheat skillet over medium-low heat. Place the sandwiches in the skillet and cook for 3-4 minutes until golden brown.

Flip the sandwiches and cook for another 3-4 minutes until both sides are golden brown and the cheese is melted.

Remove from skillet, cool for a minute, slice diagonally, and garnish with fresh basil if desired. Serve with marinara sauce for dipping.