Heat a medium skillet over medium-high heat and add the 1/2 tbsp olive oil.
Season the cubed chicken breasts with 1/2 tbsp blackening seasoning, tossing to coat evenly.
Add the seasoned chicken to the hot skillet and cook, stirring regularly, until browned and cooked through, about 10–12 minutes.
Transfer the cooked chicken to a mixing bowl and let cool slightly.
Stir in the finely diced carrots, thawed corn, halved cherry tomatoes, and 1/4 cup creamy blue cheese dressing (or mayo) until evenly combined.
Chill the chicken salad until ready to assemble.
Fill each mini Hawaiian bun with the blackened chicken salad and serve.