1. Start by preheating your oven to 375°F (190°C).

2. In a large bowl, combine the ground beef, ground pork, breadcrumbs, Parmesan cheese, parsley, egg, garlic, salt, and black pepper. Mix these ingredients until they’re well-incorporated, being careful not to overwork the mixture.

3. Shape the meatball mixture into 1-inch balls and place them on a baking sheet, making sure they’re evenly spaced.

4. Pop the meatballs in the preheated oven and bake for 20-25 minutes, or until they’re beautifully browned and cooked through.

5. While the meatballs are baking, it’s time to whip up the irresistible maple bourbon glaze. In a small saucepan, combine the maple syrup and bourbon. Cook over medium heat, stirring occasionally, until the mixture has thickened slightly, about 5 minutes.

6. Once the meatballs are out of the oven, toss them in the maple bourbon glaze until they’re evenly coated. Then, sprinkle the chopped bacon over the top, allowing the flavors to meld together.

7. Now, it’s time to build your Maple Bourbon Bacon Glazed Meatball Subs. Divide the glazed meatballs among the hoagie rolls, making sure each one gets a generous portion.

8. Top the meatball-filled rolls with the shredded mozzarella cheese, then return them to the oven for an additional 5-7 minutes. This will allow the cheese to melt and become gooey, adding the final touch of deliciousness.