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Preheat oven to 375°F. Melt butter in small skillet on medium heat. Add onion; cook and stir 5 minutes or until softened. Cool slightly. Mix tomato sauce and 1/2 teaspoon of the Italian seasoning in small bowl. Set aside.
Mix ground beef, crumbled bread, cooked onion, milk, eggs, seasoned salt, remaining 1 teaspoon Italian seasoning and pepper in large bowl. Shape into a loaf in foil-lined 13x9-inch baking pan.
Bake 45 minutes. Spoon seasoning tomato sauce over meat loaf. Bake 15 minutes longer or until cooked through. Let stand 5 minutes before slicing.