Preheat oven to 400 degrees.
Line a large cookie sheet with foil. Spray olive oil spray on the foil. Lay the chicken breasts in the middle of the cookie sheet. Sprinkle the chicken breasts with salt and pepper and the taco seasoning. Add the salsa on top of the chicken, if using.
Add the sliced peppers to one side of the cookie sheet. Sprinkle with 1/2 of the olive oil and season with salt and pepper. Mix to make sure that the seasoning is over all of the peppers.
Repeat process with the red onion slices. Place cookie sheet in the oven and cook for about 20-25 minutes or until the chicken is cooked through.
When the chicken and peppers are finished cooking, create your bowl. Add 1/4 cup cooked rice, 3 slices of chicken, peppers and onions. Top with black beans, corn and more salsa, if desired. Serve immediately.