Season both sides of the chicken with the onion and garlic powders, parsley, dried basil and oregano. Sprinkle with salt and pepper, to your desired taste.
In a large skillet, heat 1 tablespoon of olive oil over medium-high heat. Once hot, add the chicken and allow to sear for about 5 minutes, before turning. (If it seems like it's browning too much, too fast, turn your burner heat down closer to medium - you don't want to burn the outside and have raw chicken inside!) Cook for an additional 5 minutes, or until cooked through. Remove to a plate and set aside while you make the sauce.
Using the same skillet, Lower heat to medium and add another 2 teaspoons of olive oil. Add the garlic, with parsley, oregano and basil, and saute for about 1 minute, or until fragrant.
Stir in milk (or cream) and season with salt and pepper, to taste.
Bring the sauce to a low boil, then add the cornstarch slurry, and stir until the sauce begins to thicken. Reduce heat to a simmer and add the chicken back in. Turn to coat, top with extra herbs, if desired, and serve!