Season chicken breasts with garlic powder, oregano, salt, and pepper.
Place chicken in the skillet and cook for about 5 minutes on each side, until golden brown.
Add cherry tomatoes to the skillet, letting them cook and soften for about 3 minutes.
Sprinkle mozzarella cheese over the chicken and tomatoes.
Cover the skillet and let it cook for another 3-5 minutes, until the cheese is melted and bubbly.