Creating the Crispy Lemon Pepper Chicken Sandwich is a simple process if you follow these steps:

1. Marinate the Chicken: In a mixing bowl, combine buttermilk, lemon juice, and lemon zest. Add the chicken breasts, ensuring they’re well coated. Cover and refrigerate for at least 30 minutes.
2. Prepare Coating Mixture: In another bowl, mix together the flour, lemon pepper seasoning, garlic powder, onion powder, smoked paprika, salt, and pepper.
3. Heat the Oil: In a large skillet, pour in vegetable oil to cover the bottom, about 1 inch deep. Heat over medium-high heat until shimmering.
4. Dredge Chicken: Remove the marinated chicken from the refrigerator. Let excess marinade drip off before placing the chicken into the flour mixture. Dredge well, ensuring each piece is fully coated.
5. Fry Chicken: Gently place the chicken into the hot oil. Fry each side for 5-7 minutes or until the chicken is golden brown and cooked through. Use a meat thermometer to ensure the internal temperature reaches 165°F (74°C).
6. Drain Excess Oil: Once cooked, transfer the chicken to a paper towel-lined plate to absorb the excess oil.
7. Toast the Bread: While the chicken is draining, toast the slices of bread until golden and crisp.
8. Assemble the Sandwich: Spread mayonnaise or aioli on one slice of toasted bread. Layer leafy greens, a slice of chicken, and tomato slices. Top with another slice of toasted bread.
9. Serve Immediately: Cut the sandwich in half, if desired, and serve warm.

Following these clear instructions will help you achieve a Crispy Lemon Pepper Chicken Sandwich that is sure to please!