Wash onions, carrots, and broccoli thoroughly and cut them into bite-sized pieces.
Heat olive oil in a pot and sauté the onions until they become translucent.
Add carrots and broccoli and cook for another 2 minutes.
Cut chicken breast into bite-sized pieces, add to the pot, and cook evenly.
Pour 500ml of low-sodium vegetable stock and bring to a boil.
Add chopped tomatoes and simmer over medium-low heat for 10 more minutes.
Season with salt and pepper to taste and finish.