In a large bowl, mix together ground beef, breadcrumbs, milk, egg, garlic powder, onion powder, salt, and pepper until well combined. Form into meatballs.

Heat olive oil in a large skillet over medium heat. Add meatballs and cook, turning occasionally, until browned on all sides, about 10-12 minutes. Remove meatballs and set aside.

In the same skillet, melt butter over medium heat. Stir in flour to create a roux. Cook, stirring constantly, for 1-2 minutes.

Gradually whisk in beef broth and Worcestershire sauce. Bring to a simmer, stirring constantly, until the sauce thickens.

Return meatballs to the skillet, coating them in the gravy. Simmer for an additional 5-10 minutes.

Garnish with chopped parsley before serving.