Check the thickness of your chicken breasts. If needed, slice the chicken breasts in half to create thinner pieces, or place the breasts between parchment paper or plastic wrap and pound them to an even thinness.
2 pounds boneless, skinless chicken breasts
Whisk the oil, garlic, vinegar, herbs, salt, and pepper together, and pour into a sealable plastic bag or large dish.
¼ cup olive oil, 4 cloves garlic, ⅓ cup red wine vinegar, ½ cup finely chopped fresh herbs, ½ teaspoon kosher salt, ⅛ teaspoon freshly ground black pepper
Add the chicken to the plastic bag or dish and marinate for 2-8 hours.
Preheat the grill to medium-high heat (450-500°F).
Place the chicken on the grill and cook for around 10 minutes total, flipping the chicken halfway through.
Ensure the chicken has reached an internal temperature of 165°F before serving.