In a large pot, heat the oil over medium heat. Add the diced onion and saute until it becomes translucent, about 5 minutes. Be careful not to brown. Turn down heat if necessary.
2 tbsp oil, 1 cup onion, diced
Add the garlic and leeks and continue to saute for another 5 minutes until the leeks are softened. You can add a tiny bit o water if your pan is getting too dry.
1 1/2 cups leeks, thinly sliced, white and light green parts only, 3 cloves garlic, minced
Add the diced potatoes to the pot and pour in the vegetable broth. Bring mixture to a boil, then reduce heat to a simmer. Cover and cook stirring occasionally for about 20 minutes, or until the potatoes are tender.
2 lbs Keuka Gold potato, peeled and diced, 4 cups vegetable broth