There's a reason it's a classic. Great taste never goes out of style. Make this time-tested, can't miss meatloaf the centerpiece of your next family get-together.
Preheat oven to 350°F. Measure 1/4 cup tomato sauce, brown sugar and mustard into small bowl; set aside for topping. Add remaining tomato sauce, Ground Beef, bread crumbs, egg, onion, Worcestershire, thyme, garlic salt and pepper to large bowl; mix thoroughly but lightly.
Shape beef mixture into 8 x 4-1/2-inch loaf on rack in broiler pan. Spread topping over meatloaf. Bake in 350°F oven 1 hour or until instant-read thermometer inserted into center registers 160°F.
Cooking times are for fresh or thoroughly thawed ground beef. Ground beef should be cooked to an internal temperature of 160°F. Color is not a reliable indicator of ground beef doneness.
Let stand 10 minutes before cutting. Cut into slices.
Four-Pepper Meatloaf Variation: Prepare meatloaf as above, adding 1/3 cup finely chopped green bell pepper, 1/4 teaspoon ground red pepper and 1/4 teaspoon ground white pepper to Ground Beef mixture.
Picadillo-Style Meatloaf Variation: Prepare meatloaf as above, omitting thyme and adding 1/3 cup finely chopped green bell pepper, 1/4 cup raisins, 1 teaspoon ground cumin and 1/2 teaspoon dried oregano leaves, crushed, to Ground Beef mixture.