01 -
Set the oven to 400°F and line a baking sheet with parchment paper.
02 -
In a large bowl, whisk together the egg, breadcrumbs, Parmesan, Italian seasoning, minced onion, garlic powder, salt, pepper, and water. Add ground beef and turkey, then mix gently with clean hands until just combined.
03 -
Divide the mixture into 15 equal portions and roll each into a ball with slightly moistened hands. Arrange on the prepared sheet and bake for 15–20 minutes until cooked through.
04 -
With 5 minutes remaining on the meatballs, warm the pasta sauce in a covered saucepan over medium-low heat. Reduce to low if it begins to simmer, stirring occasionally.
05 -
Transfer baked meatballs to the saucepan and coat thoroughly with the sauce. Alternatively, allocate ¼ cup of sauce per three meatballs for individual subs.
06 -
Move the oven rack to the top position and set the oven to broil. Replace the baking sheet lining with foil, place the open buns on it, and arrange three meatballs with their sauce in each bun. Sprinkle 2 tablespoons shredded Mozzarella atop each portion. Broil for approximately 2 minutes until cheese melts and buns toast lightly, watching closely to prevent burning.