Season the minced meat with salt, pepper and gyros seasoning salt to taste. Cut the onion into small pieces and add to the minced meat together with the ketchup, egg, breadcrumbs and cheese. Knead everything together well and shape into a round roast.
Then place the meatloaf in a greased casserole dish and cook in a preheated oven (fan oven 180-190 ° C) for about 50-60 minutes.