Dice the chicken breast into bite-sized pieces and season lightly with a pinch of salt and pepper.
Heat the olive oil in a large cast-iron or heavy-bottomed skillet over medium-high heat.
Add the chicken to the skillet and cook for 5-6 minutes until golden brown and cooked through, then remove and set aside.
In the same skillet, add the diced red onion and bell pepper, sautéing for 3 minutes until they begin to soften.
Stir in the sweet corn and black beans, spreading them into a single layer and letting them sit undisturbed for 2 minutes to achieve a roasted char.
Add the minced garlic, halved cherry tomatoes, ground cumin, remaining salt, and pepper to the medley.
Cook for an additional 3 minutes, stirring occasionally, until the tomatoes begin to blister and release their juices.
Return the cooked chicken to the skillet and toss everything together to combine.
Remove from heat and finish the dish by stirring in fresh chopped cilantro and a squeeze of lime juice.