Making Easy Cheesy Meatball Subs is a breeze. Follow these simple steps to create this delicious dish:

1. Preheat Your Oven: Start by preheating your oven to 375°F (190°C).
2. Mix the Meatball Ingredients: In a large bowl, combine the ground beef, breadcrumbs, Parmesan cheese, parsley, egg, minced garlic, salt, and pepper. Mix until well combined.
3. Form the Meatballs: Shape the mixture into meatballs, about 1-2 inches in diameter.
4. Brown the Meatballs: In a large skillet over medium heat, add a little oil and brown the meatballs on all sides. This should take about 5-7 minutes.
5. Add Marinara Sauce: Pour the marinara sauce over the browned meatballs in the skillet, ensuring they are well coated. Let simmer for about 10 minutes, allowing the flavors to meld.
6. Prepare the Sub Rolls: While the meatballs are simmering, slice the sub rolls down the middle without cutting all the way through.
7. Assemble the Subs: Place a few meatballs in each sub roll, making sure to scoop some marinara sauce on top.
8. Top with Cheese: Generously sprinkle shredded mozzarella cheese over the meatballs in each sub.
9. Bake: Place the assembled subs on a baking sheet and bake in the preheated oven for about 10-15 minutes, or until the cheese is melted and bubbly.
10. Serve Hot: Remove from the oven and let cool for a couple of minutes before serving.

These straightforward steps will guide you in creating this incredible dish effortlessly.