Cut the chicken breast fillets into small pieces and season with salt, pepper and paprika powder. Fry vigorously in a little oil. Add the chopped peppers and fry briefly. Deglaze with the tomatoes and add the water. Add the chopped spring onions and the vegetable stock cubes. Bring to the boil once and cook on a low flame for about 15 minutes. Possibly a little more seasoning. Thicken and stir in the sour cream.