Easy vegetarian chilli

Name: Easy vegetarian chilli
Prep time: 25 min
Cook time: 55 min
Total time: 1 h 20 min
Cuisine: American, Mexican, Latin American
Ingredients: 2 tbsp vegetable oil; 2 carrots, finely chopped; 2 celery sticks, finely chopped; 2 onions, finely chopped; 2 tsp dried mixed herbs; 2 garlic cloves, crushed or finely grated; 1 red pepper, sliced; 1 green pepper, sliced; 2-3 tsp chilli powder (depending on how hot you like it); 2 tsp sweet smoked paprika; 2 tbsp tomato purée; 400g can red kidney beans, drained; 400g can black beans, drained; 2 x 400g cans chopped tomatoes; 400ml vegetable stock; cooked rice, grated cheddar and soured cream, to serve