The yogurt is the secret ingredient in this meatloaf! You can use a mixture of ground beef, veal and pork if desired. To save time you can saute the mushroom/onion mixture a day in advance and refrigerate. Also chili sauce or ketchup can be spread on top of the meatloaf before baking. For Italian-style breadcrumbs see recipe#203857, if you are using this recipe for breadcrumbs reduce the Parmesan cheese to 1/4 cup and omit the thyme.