How to make it

1. https://www.youtube.com/embed/uWtZx_JZyzc
2. Slice each hoagie bun horizontally in half. Pull out enough bread from each half to leave a ½” thick shell; rub the inside with olive oil, then toast until golden brown. Set aside until ready to use. 
3. Preheat the oven to 425°F, and line a rimmed baking sheet with parchment paper; spray the parchment with nonstick spray. Gently combine all the meatball ingredients together in a large mixing bowl. Using moistened hands or a small cookie scoop, roll the meat mixture into 1” meatballs (approx. 1 Tbsp. for each, about 16 meatballs total), placing them onto the prepared baking sheet, about 1” apart. Cook the meatballs, uncovered, on the center oven rack for 20-25 minutes.
4. Make the spicy tomato sauce: Combine all the sauce mix ingredients in a small saucepan. Heat and keep warm on the stove until ready to use.
5. In a bowl, toss cooked meatballs with spicy tomato sauce, making sure each meatball is coated with sauce. Change oven to low broil.
6. To build the meatball subs, add 4 meatballs to each of the bottom halves of the buns; top with 2 pieces of provolone cheese. Broil on low (to prevent the cheese from burning and the bread from getting overly toasted) until the cheese is melted and browned, 1 to 2 minutes. Add more sauce to each sandwich if desired and sprinkle each sub with sesame seeds. Top with the remaining hoagie roll halves. Serve immediately. Enjoy!