Preheat your oven to 375°F (190°C).
In a large oven-safe skillet, heat the olive oil over medium heat.
Season the chicken breasts with salt, pepper, oregano, and basil. Add them to the skillet and sear for about 5 minutes on each side, until golden brown.
Add the minced garlic to the skillet and cook for an additional minute, stirring frequently to avoid burning.
Pour the diced tomatoes (with their juice) over the chicken in the skillet.
Sprinkle the shredded mozzarella cheese evenly over the top.
Transfer the skillet to the preheated oven and bake for 25-30 minutes, or until the chicken is cooked through (internal temperature should reach 165°F).
Remove from the oven and let it rest for 5 minutes. Garnish with fresh basil before serving.