Place the chicken breasts between plastic wrap and pound to an even thickness.
Season both sides of the chicken with salt and ground black pepper.
In a small bowl, combine 2 tablespoons taco seasoning and 3 tablespoons all-purpose flour. Sprinkle the mixture over the chicken and toss or pat to coat evenly; discard any leftover seasoning.
Heat a 12-inch skillet over medium-high heat and melt 2 tablespoons unsalted butter.
Add the coated chicken to the skillet in a single layer and cook 3 minutes without moving, then flip and cook another 4–6 minutes until the chicken reaches 165°F (74°C).
Remove the chicken from the skillet and set aside to cool, then slice into thin strips.
In a large bowl add 4 cups chopped romaine lettuce and set aside.
In the same skillet (dry) over medium-high heat, add the 2 cups sliced red bell pepper and cook about 2 minutes until slightly tender; remove and let cool.
Add the cooled peppers, drained corn, drained black beans, 1 cup halved cherry tomatoes, and sliced chicken to the bowl with the lettuce.
Drizzle with 1/2 cup Hidden Valley Chili Lime Dressing, toss gently to combine, and serve immediately.