Easy! Easy! Easy to do on your own, and then you know exactly what's in it!
2 1/2 tablespoons dried minced onion
4 cubes beef bouillon, crumbled (for C1, use chicken or vegetable bouillon)
1 teaspoon onion powder
1/8 teaspoon salt
1/8 teaspoon ground black pepper
AllRecipes: Onion Soup Mix Recipe