In a large mixing bowl, combine ground beef, ground pork, breadcrumbs, grated Parmesan cheese, eggs, minced garlic, chopped parsley, salt, and black pepper. Mix until well combined.

Form Meatballs

Using your hands, shape the meat mixture into 6 equal-sized meatballs, about 2 inches in diameter.

Bake Meatballs

Place the meatballs on a baking sheet lined with parchment paper. Bake in the preheated oven for 20-25 minutes or until cooked through and browned.

Marinara Sauce Preparation

Cook Onion and Garlic

In a large saucepan, heat olive oil over medium heat. Add chopped onion and sauté until translucent, about 5 minutes. Add minced garlic and cook for an additional 1-2 minutes until fragrant.

Add Tomatoes and Seasonings

Stir in the crushed tomatoes, dried oregano, sugar, salt, and black pepper. Bring to a simmer.

Simmer Sauce

Reduce heat to low and let the sauce simmer for about 20 minutes, stirring occasionally. Add fresh basil before serving.

Combine Meatballs and Sauce

Once the meatballs are done baking, add them to the marinara sauce. Let them simmer in the sauce for an additional 5 minutes to absorb the flavors.