Place the chicken breasts in a plastic bag and lightly pound them to even thickness. Season both sides with salt, paprika, garlic powder, cumin, pepper, and chili. Heat the olive oil in a large skillet over medium heat. Sear the chicken for about 5 minutes per side until golden and chicken is cooked to an internal temperature of 165F.
In a separate small bowl, combine all dressing ingredients: mayonnaise, sour cream, buttermilk, lime juice, mustard, cilantro, paprika, and pepper. Whisk the dressing thoroughly until smooth and creamy.
Transfer the chicken to a cutting board and let rest for 5 minutes. Slice the rested chicken into thin strips or small cubes.
Chop the romaine leaves and place them in a large salad bowl. Add chopped shallot, corn, shredded cheese, crumbled bacon, cherry tomatoes, diced avocado and beans, Toss wekk then top with the chicken. Drizzle generously with the prepared dressing and toss more if desired, Serve topped with sliced jalapeño and lime wedges.