Add the ground beef, homemade sourdough breadcrumbs, egg, garlic powder, parsley, basil, salt, and parmesan cheese to a large bowl. Mix by hand until the ingredients are just incorporated. Overmixing the ingredients can lead to a tough meatball.
1 lb ground beef, 3/4 cup sourdough breadcrumbs, 1 egg, 1/4 teaspoon garlic powder, 1/4 teaspoon oregano, 1/4 teaspoon parsley, 1/4 teaspoon basil, 1/2 teaspoon salt, 1 Tablespoons Parmesan cheese