Make mine like this:
Fry up chicken (or preferred meat content – I’ve even used horse!) in a paella pan with oil, garlic & onion.
Once browned, add rice (preferably risotto rice) and fry for a minute or 2 to brown the rice. Stir-fry in some peppers & peas at the same time.
Add enough water to just about cover all of that. Stir-in some saffron. Put the lid on the pan and leave for about 20 mins or so. If you have mussles, cockles etc in their shells, put them in when you put the lid on. Add prawns etc in the last 5 minutes. Raw squid should get pan-fried early on.
Ideally, don’t stir at all once you’ve put the lid on. You want the rice at the bottom of the pan to caramelise a bit.
When the water has all bit disappeared and your mussels are open, it’s ready!