Creating the Crispy Dill Chicken Sandwich is simple when you follow these steps:

1. Prepare the Marinade: In a bowl, whisk together the buttermilk, Dijon mustard, garlic powder, onion powder, salt, and black pepper.
2. Marinate the Chicken: Place the chicken breasts in the marinade, ensuring they are fully coated. Cover and refrigerate for at least 30 minutes.
3. Set Up Breading Station: In one bowl, place the flour. In a second bowl, combine the panko breadcrumbs and chopped dill.
4. Coat the Chicken: Remove the marinated chicken from the fridge. Dredge each piece in flour, shaking off excess, then dip into the panko mixture, pressing to adhere.
5. Heat the Oil: In a large skillet, heat vegetable oil over medium-high heat until shimmering.
6. Fry the Chicken: Carefully add the breaded chicken to the skillet. Cook for about 5-7 minutes on each side, or until golden brown and cooked through.
7. Drain Excess Oil: Once cooked, transfer the chicken to a paper towel-lined plate to drain excess oil.
8. Toast the Buns: In the same skillet, lightly toast the sandwich buns until golden.
9. Assemble the Sandwich: On the bottom half of each bun, place a lettuce leaf, followed by the crispy chicken, tomato slices, and dill pickles. Add your favorite sauce if desired.
10. Top and Serve: Place the other half of the bun on top and serve immediately.

Following these steps will ensure that your Crispy Dill Chicken Sandwich turns out perfectly every time!