Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.

In a large bowl, combine ground beef, breadcrumbs, egg, onion, garlic, Worcestershire sauce, salt, and pepper. Mix gently until combined—don’t overwork the meat.

Roll mixture into 1 1/2-inch meatballs and place on the prepared baking sheet.

Bake for 15–18 minutes, or until cooked through.

While meatballs cook, warm the BBQ sauce in a skillet over low heat.

Transfer cooked meatballs to the skillet and toss to coat in sauce.

Place 4–5 meatballs into each sub roll. Top with shredded cheddar and chopped bacon.

Arrange subs on a baking sheet and broil for 2–3 minutes, until cheese is melted and bubbly.

Garnish with parsley and serve hot.