Question

Cuando se prepara la paella en una paellera, es posible asarla en el horno sin tapa?

Answer 1

If what you're asking for is the translation it is: When you prepare the paella in a paellera, is it possible to cook it in the oven without lid?

Answer 2

Translation:

"When preparing the paella in a paella pan, is it possible to roast it in the oven without a lid?"

yes, it is possible and you should never cover a paella pan.