Baked tiella rice

Name: Baked tiella rice
Ingredients: 300g potatoes; 1 onion; 1 clove of garlic; 2 sticks of celery; 400g ripe cherry tomatoes; 1 bunch of fresh flat-leaf parsley (30g); 60g Parmesan cheese; 400ml Prosecco; extra virgin olive oil; 500g long-grain rice; 750g mussels, scrubbed, debearded, from sustainable sources; 1 courgette