In a large mixing bowl, combine the ground beef and egg until well mixed.

Stir in the breadcrumbs, grated Parmesan cheese, garlic powder, and dried Italian herbs until evenly distributed.

Form the mixture into 1- to 2-inch meatballs.

Heat olive oil in a skillet over medium heat. Add the meatballs and cook until browned on all sides and cooked through, about 3 to 5 minutes per side.

In a separate saucepan, warm the tomato sauce over medium-low heat.

Transfer the cooked meatballs to the saucepan with the tomato sauce and let them simmer for about 15 minutes to absorb the flavors.