Creating the Crunchy Chicken Romesco Sandwich involves several simple steps:

1. Prepare the Chicken:
– Place the chicken breasts in a bowl with buttermilk. Allow to marinate for at least 30 minutes (or overnight in the fridge for best results).

2. Make the Romesco Sauce:
– In a food processor, combine roasted red peppers, sun-dried tomatoes, almonds, garlic, red wine vinegar, smoked paprika, salt, and pepper.
– Pulse until semi-smooth. While blending, slowly drizzle in olive oil until your desired consistency is achieved. Set aside.

3. Prepare the Coating:
– In a shallow dish, combine flour, paprika, garlic powder, salt, and black pepper.
– Remove the chicken from the buttermilk and dredge in the flour mixture, ensuring even coverage.

4. Fry the Chicken:
– Heat oil in a large skillet over medium-high heat. Once the oil is hot, carefully add the coated chicken breasts.
– Fry for about 5-7 minutes per side or until golden brown and cooked through. Use a meat thermometer to ensure an internal temperature of 165°F (75°C).
– Once cooked, transfer to a paper towel-lined plate to drain excess oil.

5. Toast the Bread:
– If desired, toast the bread slices until golden brown for extra crunch.

6. Assemble the Sandwich:
– Spread a generous amount of Romesco sauce on the base of each toasted bread slice.
– Add a layer of crunchy fried chicken, followed by fresh arugula, and avocado slices if using. Top with another slice of bread.

7. Serve:
– Cut the sandwich in half, serve accompanied by lemon wedges, and enjoy!