Creating the perfect Grilled Chicken Sandwich is easy when you follow these simple steps:

1. Prepare the Chicken: Place the chicken breasts in a zip-top bag and pound them to an even thickness for uniform cooking.
2. Marinate: In a bowl, mix olive oil, garlic powder, paprika, salt, and pepper. Add the chicken breasts to the marinade, ensuring they are well coated. Allow marinating for at least 15 minutes for maximum flavor.
3. Preheat the Grill: Heat your grill or grill pan over medium-high heat.
4. Grill the Chicken: Once the grill is hot, add the marinated chicken breasts. Grill for about 6-8 minutes on each side, or until the internal temperature reaches 165°F (75°C).
5. Toast the Bread: While the chicken is grilling, toast the slices of bread on the grill until golden brown.
6. Assemble the Sandwich: Spread mayonnaise on one side of each slice of toasted bread. Place a grilled chicken breast on the bottom slice.
7. Add Toppings: Layer the lettuce, tomato slices, and pickles (if using) on top of the chicken.
8. Finish: Top with the second slice of bread, mayonnaise side down.
9. Slice and Serve: Cut the sandwich in half diagonally and serve immediately.

These steps will guide you in creating a delicious Grilled Chicken Sandwich that is sure to impress!