In a big frying pan, lightly coated on olive oil, add ground chicken, cover and cook on low so that it retains the juices. Chop it up further with a spatula and then add green bell pepper, onion, a good dash of fennel seeds, stir to combine then cover and let it simmer for 10 - 15 minutes , stirring occasionally.
Meanwhile, mash the potatoes with a good amount of butter and a splash of milk. Set aside.
Add mildly spicy tomato sauce to the chicken mixture and stir. Simmer again, stirring occasionally until heated through. Season with salt and pepper to taste.
To plate, make a flat bed of mashed potatoes on a plate (add a bit more butter to the center) and ladle the chicken mixture over the top.
Garnish with quartered plum tomatoes.