Begin by preparing all your vegetables. Chop the cabbage into bite-sized pieces, dice the carrots, onions, and potatoes, and mince the garlic.
In the crockpot, add the prepared cabbage, carrots, onions, garlic, and potatoes.
Pour in the can of diced tomatoes, including the juice, and add the vegetable broth.
Sprinkle in the Italian seasoning, salt, black pepper, and place the bay leaf on top. If using, drizzle with olive oil for added richness.
Stir the mixture gently to combine the ingredients.
Cover the crockpot with its lid and set it to cook on low heat for about 6 hours.
Once done, remove the bay leaf before serving.
Ladle the soup into bowls and garnish with fresh parsley if desired.