Heat a large soup pot over medium high heat and drizzle with olive oil. Add the onions plus a pinch of salt and pepper and saute until they begin to soften, about 3-4 minutes. Next add the garlic, celery and carrots plus another pinch salt and pepper. Continue sautéing until veggies are soft, another 4-5 minutes.
Pour the chicken broth in to the pot and bring to a boil. Next, stir in the 15 Bean Soup (soaked beans and seasoning packet) along with diced ham, thyme, bay and cayenne if using. Stir well then bring to a boil. Reduce heat to low and simmer for 30 minutes or until beans are tender and cooked through. Garnish with fresh parsley to serve.
Notes
While delicious with ham, this soup is also great with smoked sausage, kielbasa, or even chorizo. Freezes well and is great the next day for lunch.