If the herbed gravy turns out too thick, simply whisk in a bit more chicken broth until you reach your desired consistency. If it’s too thin, let it simmer for a few more minutes until it thickens up. You can also mix a small amount of cornstarch with water to create a slurry, then whisk it into the simmering gravy to help thicken it. Adjust the seasoning as needed after making any adjustments.