Dry Onion Soup

I've made pot roast with this recipe twice now and it has turned out wonderfully! I usually use the packaged onion soup mix from the store but noticed I didn't feel well after eating it. My guess is the MSG in it and the other preservatives. The bouillon I like to use is called Better Than Bouillon. This makes one packet worth and I use half this amount when making pot roast.

4 tsp. beef bouillon
8 tsp. dried onion flakes
1 tsp. onion powder
1/4 tsp. pepper