I personally love to use the Better Than Bouillon Vegetable base. My second favorite option is the Not-Chicken Bouillon Cubes. However, both of these do contain sugar. If you are looking for a sugar-free option you can substitute the water and bouillon for vegetable broth. Just make sure that you like the taste of your broth since it is a prominent flavor.
Also, if you don’t have the fresh herbs on hand you can substitute them for 1 tsp poultry seasoning. Just make sure you add the seasoning to the garlic and onions before boiling with the potatoes. If you add it to your gravy after it is done cooking the seasoning will be too strong.
Cashews can be omitted for nut-free.