Prepare chicken and season with salt, pepper, and garlic powder.
Heat olive oil over medium-high heat in a large skillet. You want a large skillet with a lid.
Add chicken and brown on all sides until almost cooked through. 5-6 minutes.
Remove browned chicken from the skillet and set aside.
Add onion to the skillet and saute for a 2-3 minutes until soft.
Add rice to skillet.
Stir and toast rice, coating the rice in the oil and onion for 2-3 minutes, until fragrant.
Add salsa and water to the skillet.
Bring to a boil.
Cover skillet, reduce to a simmer and cook for 15 minutes. The rice will be just about cooked.
Remove lid from skillet and stir in the chicken, black beans and corn.
Replace cover and cook for another 5 minutes, until the chicken is cooked through.
Serve the chicken and rice topped with Shredded cheese, Sour Cream and Jalapenos, if desired.