Baked Meatballs that melt in your mouth!

Meatballs
1 Tablespoon olive oil
½ cup onion, finely diced
3 cloves minced garlic
1/3 cup Italian breadcrumbs
¼ cup Parmesan cheese, grated from a block
½ teaspoon oregano
1 teaspoon kosher salt
½ teaspoon pepper
1/3 cup milk
1 large egg
1 lbs. ground beef
½ lb. ground pork
Sauce + Cheese
32 oz marinara sauce
2 cups shredded mozzarella cheese
Fresh Parsley, to garnish
Preheat oven to 375 degrees.