Below is a recipe I've been using for a while now that I lifted from this old reddit thread. I've found it works great as an addition to most soups, sauces or gravies either alone or as a flavor booster (honestly, nutritional yeast by itself will do that to a large extent and is seriously underutilized).

Vegan Chicken Bouillon Based on this recipe

• 1 cup nutritional yeast flakes
• 3 tablespoons onion powder
• 2 tablespoons garlic powder
• 2 tablespoons dried parsley
• 1 tablespoon celery seeds
• 1 tablespoon table salt
• 1 teaspoon Old Bay (or paprika)*
• 1 teaspoon dried thyme
• 1 teaspoon dried sage
• 1 teaspoon turmeric powder

Blend all ingredients to a powder. Dissolve 2 teaspoons per cup of boiling water, then adjust ingredients and ratios to taste. Poultry Seasoning can also be a good addition. Store in an airtight container.

*I'm not a fan of paprika, because it always seems to disappear when combined with other ingredients. Old Bay, on the other hand, complements whatever it's added to without overpowering.