Incredible Meatball Subs Recipe

Heat olive oil in a large skillet over medium heat. Add frozen meatballs and cook for 8-10 minutes, turning occasionally until they're heated through and lightly browned on all sides. If using homemade meatballs, cook them completely before proceeding.

Pour marinara sauce over the meatballs in the skillet. Add Italian seasoning and garlic powder, then simmer for 5-7 minutes until the sauce is heated through and the flavors meld together. The sauce should be thick enough to coat the meatballs without being too watery.

Preheat your oven to 375°F. Slice the sub rolls lengthwise, being careful not to cut all the way through - you want them to open like a book but stay connected at the bottom. Lightly toast the rolls in the oven for 2-3 minutes if desired.

Divide the meatball and sauce mixture evenly among the four sub rolls, making sure each sandwich gets 5-6 meatballs. Top generously with mozzarella cheese and sprinkle Parmesan over each sandwich. The cheese should cover the meatballs completely for the best melting results.

Place the assembled subs on a baking sheet lined with parchment paper. Bake for 12-15 minutes until the cheese is melted, bubbly, and lightly golden brown on top. Let them rest for 2-3 minutes before serving to prevent the filling from spilling out when you bite into them.