Mix the Ingredients: In a large bowl, combine the ground beef, ground pork, garlic powder, onion powder, Italian seasoning, salt, black pepper, eggs, parmesan cheese, and panko breadcrumbs. Mix until well combined. Slowly add the water and mix until the meat mixture is moist and holds together.

Shape the Meatballs: Form the mixture into medium-sized meatballs (about 1 ½ inches in diameter). You should have around 24-30 meatballs depending on size.

Cook the Meatballs: Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper and arrange the meatballs evenly on the sheet. Place in the oven and bake for 15 to 20 minutes, or until the meatballs are beautifully browned and cooked all the way through.

Sauté the Garlic: In a spacious saucepan, warm the olive oil over medium heat. Add the minced garlic and red pepper flakes, and sauté for about 1-2 minutes until fragrant, being careful not to burn the garlic.

Make the Tomato Sauce: Add the crushed tomatoes, salt, granulated sugar, and Italian seasoning to the pan. Stir well and bring the sauce to a simmer. Reduce the heat to low and let it cook for about 20-25 minutes, stirring occasionally.

Finish the Sauce: Stir in the chopped fresh basil and adjust the seasoning to taste. Allow the sauce to simmer for another 5 minutes.

Prepare the Rolls: Preheat the broiler on your oven. Cut the sub rolls in half and lightly toast them under the broiler until they are golden brown and crispy.

Layer the Sandwiches: Spoon a generous amount of tomato sauce on the bottom half of each toasted sub roll. Add 3-4 meatballs on top of the sauce. Spoon a little more sauce over the meatballs. Top each sub with shredded provolone, fontina, and parmesan cheese.

Melt the Cheese: Place the subs under the broiler for 1-2 minutes, or until the cheese is fully melted and bubbly.

Garnish and Serve: Garnish with torn fresh basil if desired, and serve your meatball subs hot.