Begin by marinating the chicken breasts in a mixture of dill pickle juice, sour cream, cayenne pepper, smoked paprika, ancho chili powder, salt, black pepper, and garlic powder. Let it sit for at least 15 minutes to absorb the flavors. Cook the marinated chicken in a skillet with olive oil over medium heat for about 5-7 minutes per side, or until fully cooked. Once done, let it rest for a few minutes before slicing it thinly.
In a bowl, combine mayonnaise, hot jalapeño salsa, sour cream, fresh cilantro leaves, lime juice, salt, black pepper, ancho chili powder, and garlic powder. Whisk until the dressing is smooth and well-blended. Taste and adjust seasoning if necessary.
In a large salad bowl, layer the chopped romaine lettuce, halved cherry tomatoes, black beans, corn kernels, sliced red onion, diced avocado, shredded cheddar cheese, tortilla strips, and chili lime pepitas. Top with the sliced spicy chicken. Drizzle the prepared dressing over the salad. Toss gently to combine all ingredients evenly.