Combine the taco seasoning, olive oil, salt, pepper, and cumin in a bowl. Add the chicken and stir together to coat. Set aside.
Add the rice, olive oil, water, salsa, salt, taco seasning, garlic and cilantro a pot and bring it to a boil. Cover and reduce to a simmer and cook for 10 minutes. Turn off the heat and steam for another 10 minutes. No peeking or stirring!
Heat up a skillet or grill pan over medium heat. Add the remaining olive oil and let it warm up, then add the chicken breast to the pan. Over medium heat, cook the chicken for 4-5 minutes, then flip it and cook for an additional 4-5 minutes, until it's firm to the touch and has color on the outside. If using a meat thermometer, the internal temp should read 165 F (79 C). Remove the chicken from the pan and let it rest for 10-15 mins. Once it has cooled, chop the cicken into bite-sized pieces.
Optional: To the pan you used for the chicken, add the black beans with a pinch of salt and stir to warm them up.
Assemble! Divide salsa rice and sliced chicken among three meal prep containers. Add the black beans, corn, salsa (2 TBSP each or more), lime wedges, cilantro, and cheese. Let it cool completely before storing in the fridge.