Preheat the oven to 400℉ (200°C). Line a small baking sheet with parchment paper. Coat the chicken in olive oil and season with salt and black pepper. Bake in the preheated oven for 25 minutes or until internal temperature reaches 165℉ (75°C). Let the chicken cool and shred.
Make the dressing by adding the ingredients to a food processor or blender and blend until smooth.
While the chicken is baking, chop the red bell pepper, tomatoes, red onion, and cilantro. Drain and rinse the black beans and corn if using canned. Add everything to a large bowl including the black beans, corn, veggies, cilantro, and shredded chicken.
Pour the dressing on top and give everything a good toss. Add more salt to taste.
