This has to be the easiest way to cook fish - it's wrapped up in a package, making its own sauce and doesn't smell up your kitchen. You can cook it your oven or air fryer. Easy AND tidy - you have to love that!
Cut out 2 large squares of parchment paper – about 13-inches by 15-inches each. Place a fillet of halibut on one half of each piece of paper. Season the fish very well with salt and pepper. Top each fillet with lemon slices and thyme sprigs. Brush the outer rim of the parchment squares with the beaten egg white. Dot each fillet with 1 tablespoon of butter and sprinkle 2 tablespoons of white wine on each piece of fish.
Place the two packages onto a baking sheet and bake in the oven for 10 to 12 minutes or, cook in the air fryer for 10 minutes each. Depending on the size of your air fryer, you may have to cook them one package at a time. The package should be puffed up and slightly browned when fully cooked. The fish should feel firm to the touch (you can often, carefully, press on the fish through the paper).