"This fish fillet and peppers en croute dish is a wonderful, fancy meal for two, ideal for special occasions or Valentine's Day. Despite the name, this is actually a very simple meal to prepare and you can use whichever fish you prefer, most fillets should work well!"
Preheat the oven to 425 degrees F (220 degrees C). Line a baking sheet with parchment paper.
Place each piece of cod fillet on one of the puff pastry rectangles and season well with salt and pepper. Sprinkle each fish fillet with 1/2 the feta cheese, the roasted red peppers, and the thyme leaves. Fold pastry over the fish and pinch edges together to make a pouch. Brush top with beaten egg and transfer to the prepared baking sheet.
Bake in the preheated oven until puff pastry is golden brown and fish flakes easily with a fork, about 30 minutes.