Warm the cream in the microwave; not hot, just warmed to take out the chill and prevent it from separating, and grate the garlic. In a small dish, combine the cornstarch and water to make a slurry and set aside.
Make the sauce:
Heat a large pan over medium heat and melt the butter. Add the garlic and Italian seasoning, and sauté for about a minute until fragrant.
Pour in the chicken broth (or stock) and the warmed cream (or half and half) into the pan. Stir and bring the liquid to a boil. Reduce the heat to low and simmer the sauce for 5 minutes to thicken. Add the slurry, stir, and simmer for one more minute. Turn off the heat. The sauce will thicken as it sits. If you need more sauce, you can thin it out with additional broth.
Serve:
Pour the sauce over chicken breasts, combine it with pasta, or pour it over mashed potatoes.
Notes
Swap fresh garlic for 1 teaspoon of garlic powder.
Swap the Italian seasoning for 1 teaspoon oregano or ½ teaspoon of dried thyme.
Want to use fresh herbs? Finely mince the herbs and double the amount of dried.