I love Spanish food and try not to eat anything else when in Spain.
I like the ready made omelettes, best warmed up in the oven, but you could make your own.
Bread, cheese, olives, ham, crisps.
Gambas a pil pil (prawns with garlic, olive oil and paprika) with nice bread because it's so quick and easy.
Tuna and olive salad with whatever other bits you like.
Marinaded chicken or pork with bread, salad, potatoes of some sort. Look for pinchito spice mix.
Thick hot chocolate with churros
Ready made pizza.
Allioli in the yellow tub,
Chorizo, chick pea and tomatoey/peppery stew.
Paella
But I realise the above might not suit young DC who won't eat anything unfamiliar, but I also don't think any of the above is particularly 'out there' if you use boneless/shelled meat and seafood in the paella.