Slice the onion into thin pieces.

In a pot, bring the water to a boil and add the chicken stock powder, soy sauce, salt, and pepper.

Add the sliced onion to the pot and simmer until softened and sweet, about 5 minutes.

Add the dried wakame and simmer for an additional 2 minutes.

Cut the avocado into cubes and gently add to the soup. Heat for 1 minute without boiling.