Add the avocado oil to a large stock pot and heat to medium-high. Add the yellow onion and sauté, stirring occasionally, until translucent, about 5 minutes. Add the garlic and continue sautéing another 2 minutes, until very fragrant.
Pour the vegetable broth into the pot and add the chopped russet potato and carrots. Cover, and bring to a full boil. Cook until potato is soft and just slightly al dente, about 5 minutes.
Add the remaining ingredients, stir well, cover, and return to a boil. Once the soup comes to a full boil, reduce the heat and simmer for 5 minutes, or until the vegetables have reached desired done-ness. For very soft vegetables, cook an additional 15 to 20 minutes. Taste the soup for flavor and add more sea salt to taste.
Serve in big bowls and enjoy!