Meatball Boats

Meatballs:
Preheat the oven to 425°F.
In a large mixing bowl, beat the eggs slightly.
Add all other meatball ingredients to the bowl and mix well with your hands until combined. Avoid overmixing.
Lightly spray a large cookie sheet (you may need two) with cooking spray. Use a 1/4 cup measuring cup to scoop out meat mixture and form into meatballs, placing each one on the sprayed cookie sheet.
Cover the bottom of the cookie sheets with 2 cups of beef broth.
Place in the preheated oven and bake for about 25 minutes.
Tomato Sauce:
In a pan, sauté onions in olive oil until they begin to brown.
Add garlic until fragrant (about 30 seconds).
If using whole tomatoes, hand-crush them and add them to the pan along with the pan juice, parsley, red pepper flakes, basil, oregano, and salt.
Simmer for 15 minutes.
Add the baked meatballs and warm through for an additional 10 minutes.
Boats:
Preheat the oven to 450°F.
Take a hoagie roll and cut around the top with a serrated knife.
Pull off the top and tear out the middle to make a boat. Discard the excess bread or save it for other purposes.
Place 2 thick slices of mozzarella cheese in the bottom of the boat. Brush the exposed bread inside with olive oil.
Bake until the cheese melts.
Place 3 meatballs into each boat, top with sauce, and sprinkle with fresh grated parmesan cheese.
Enjoy your delicious Meatball Subs!