Preheat your oven to 275°F (135°C).
Place chicken breast in a baking dish and add 2-3 tablespoons of chicken broth or water to create steam.
Brush the chicken with a thin layer of olive oil or melted butter.
Cover the dish tightly with aluminum foil, creating a seal to trap moisture.
Place in the oven and heat for 10-15 minutes for a single breast (adjust time for multiple pieces).
Check that the internal temperature reaches 165°F (74°C) using a meat thermometer.
Allow to rest for 2 minutes before serving.