Preheat your oven to 400°F (200°C).

In a mixing bowl, combine ground beef, breadcrumbs, Parmesan cheese, chopped parsley, garlic powder, onion powder, salt, black pepper, and the egg. Mix by hand until just combined.

Shape the mixture into meatballs about 1.5 inches in diameter, ensuring they are uniform in size.

Line a baking sheet with parchment paper or lightly grease it with oil.

Place the meatballs on the prepared baking sheet, leaving space between each ball for even cooking.

Bake the meatballs in the preheated oven at 400°F (200°C) for 25 minutes, or until the internal temperature reaches 160°F (70°C).

While the meatballs bake, warm the marinara sauce in a saucepan over medium heat until heated through, about 5 minutes.

Serve the meatballs with the warm marinara sauce drizzled on top and enjoy.