Meatball black bean chilli

Name: Meatball black bean chilli
Cuisine: American, Mexican, Latin American
Ingredients: 700 g minced beef; 1 onion (chopped); 3 tbsp. breadcrumb; 100 ml milk (or buttermilk); 2 tbsp olive oil; 2 mix peppers (chopped); 2 garlic cloves (crushed); 2 tsp. smoked paprika; 2 tsp. coriander seeds (crushed); 2 tsp ground cumin; 2 tin chopped tomatoes (( 400g )); 2 tin black beans (drained and rinsed ( 400g )); 2 tbsp. fresh coriander (chopped); cooked rice (to serve); 4 tbsp. sour cream (to serve)