Preheat the grill to high heat.
Pat the chicken dry and season both sides with salt and pepper.
In a small bowl, combine the smoked paprika, garlic powder, and brown sugar. Sprinkle the seasoning evenly over the chicken.
Place the chicken on the hot grill and cook for 5 to 6 minutes per side, or until the internal temperature reaches 165°F.
Grill the corn alongside the chicken, turning occasionally until lightly charred on all sides.
During the final few minutes of cooking, brush the chicken generously with BBQ sauce. Flip and brush several times to create a caramelized glaze.
Remove the chicken and corn from the grill. Let the chicken rest for 5 to 10 minutes before slicing. Once the corn is cool enough to handle, cut the kernels from the cobs.
To prepare the honey mustard vinaigrette, whisk together the apple cider vinegar, honey, Dijon mustard, garlic, salt, and pepper. Slowly drizzle in the olive oil while whisking until smooth.
In a large serving bowl, combine the chopped romaine lettuce with a pinch of salt and pepper.
Add the black beans, cherry tomatoes, cheddar cheese, pickled onions, green onions, chives, and grilled corn.
Slice or chop the grilled BBQ chicken and place it on top of the salad.
Drizzle generously with the honey mustard vinaigrette and toss just before serving. This Summer BBQ Chicken Chopped Salad is best enjoyed fresh while the chicken is still slightly warm.