Prepare the marinade: In a small bowl, whisk together the olive oil, balsamic vinegar, minced garlic, dried basil, dried oregano, salt, pepper, and red pepper flakes (if using).
Marinate the mozzarella balls: Place the mini mozzarella balls in a shallow dish or a jar. Pour the marinade over the mozzarella balls, ensuring they are well coated. Cover the dish or jar and refrigerate for at least 1 hour, or ideally overnight to let the flavors meld.
Serve: Before serving, let the marinated mozzarella balls come to room temperature. Garnish with fresh basil leaves if desired. Serve as a delicious keto-friendly appetizer or snack.