Defrost frozen fillets. Season the fish fillets with salt, pepper and paprika and sprinkle with herbs as desired (I used oregano).
Grease a baking dish with a little butter. Put the pangasius fillets in the baking dish. Dice the bell pepper and spread on the fish. Put a few more flakes of butter on the fish and sprinkle the fillets with the grated cheese.
Bake at 200 ° C top and bottom heat for 20-30 minutes.