Cut the chicken tenders into bite-sized pieces.
Dice onion, carrot, celery, and tomato.
Heat olive oil in a pot and sauté the onion.
Add carrot and celery and continue sautéing.
Add the chicken tenders and sauté everything together.
Add tomatoes and water, then bring to a boil.
Season with salt and pepper.
Simmer over medium heat until all ingredients are cooked through.