Preheat the oven to 375°F/190°C
Dry chicken breasts with a paper towel and rub with olive oil all over, liberally sprinkle with Badass Blackened Seasoning and gently pat to make sure the seasoning properly adheres to the chicken. Place the breasts on a plate and allow them to sit for 5 minutes to allow the seasoning to bond to the chicken breasts. Meanwhile, heat the cast iron pan over a high flame, then toss in the butter...
Add the Blackened Seasoned Chicken breast side down and allow it to brown for approximately 5 minutes. If the pan becomes too hot and smells like the chicken may be burning then reduce the heat as needed. You need high heat to properly blacken the chicken. (You'll see I'm cooking one at a time, to give them room to brown and not steam).
Check to make sure the breasts are browned and flip to the other side to brown. If you are browning in stages, then move the browned breast to a plate and finish blackening the rest of your chicken.
Return the chicken to the pan (if needed) and place into the preheated oven, bake for 35-45 minutes until you reach an internal temperature of 160°F/71°C. Depending on the size of the breasts adjust the cooking time accordingly. Remove from the oven and allow to rest for 5 minutes.
You can debone the chicken if desired, plate and spoon Fresh Mango Salsa over the top and serve with a side of rice if desired.