Prep the pan and oven: Heat your oven to 400°F (200°C). Line a sheet pan with parchment for easy cleanup.
Make the breadcrumb mixture: In a bowl, combine breadcrumbs, 2 tablespoons milk or water, and 1 tablespoon olive oil.
Stir until the crumbs are evenly moistened.
Build the meatball mixture: Add ground turkey, 1 grated small onion (squeeze out extra liquid if very juicy), 2 minced garlic cloves, 2 tablespoons chopped parsley, 1/4 cup grated Parmesan, 1 teaspoon kosher salt, and 1/2 teaspoon black pepper. Mix gently with your hands until just combined. Do not overmix.
Form the meatballs: Scoop into 1.5-inch balls (about golf ball size).
You should get 16–20. Place on the prepared pan.
Roast the meatballs: Bake for 12–15 minutes, until just cooked through (165°F inside). They’ll finish in the sauce, so avoid overbaking.
Start the spicy sauce: In a large skillet or Dutch oven, warm 2 tablespoons olive oil over medium heat.
Add 2–3 minced garlic cloves and a pinch of red pepper flakes. Cook 30 seconds until fragrant.
Build flavor: Stir in 1 tablespoon tomato paste and 1 teaspoon smoked paprika. Cook 1 minute, letting it darken slightly.
Add tomatoes and heat: Pour in the tomato sauce.
Stir in 1–2 tablespoons chili paste and 1–2 teaspoons hot honey (or regular honey plus a few dashes of hot sauce). Season with 1 teaspoon kosher salt and a few grinds of pepper. Simmer 5–8 minutes, stirring occasionally, until slightly thickened.
Marry the meatballs and sauce: Gently add the baked meatballs to the sauce.
Simmer on low for 5–10 minutes so they absorb flavor. Taste and adjust salt, sweetness, or spice as needed.
Toast the rolls: Split the hoagie rolls. Lightly butter the cut sides if you like.
Toast under the broiler or on a skillet until golden at the edges.
Assemble the subs: Spoon a layer of sauce onto each roll. Nestle 3–5 meatballs inside (depending on roll size). Spoon more sauce over the top.
Add cheese and melt: Lay provolone or mozzarella slices over the meatballs.
Broil 1–2 minutes, just until the cheese melts and bubbles. Watch closely.
Finish and serve: Sprinkle with extra parsley or a pinch of red pepper flakes if you want. Serve hot with plenty of napkins.