01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper or aluminum foil, then lightly grease its surface.
02 - In a large mixing bowl, gently combine the ground beef, breadcrumbs, egg, milk, finely chopped onion, minced garlic, chopped parsley, salt, black pepper, smoked paprika, and Worcestershire sauce. Mix until just incorporated, being careful not to overmix.
03 - With slightly damp hands, form the meat mixture into 1.5-inch diameter meatballs and arrange them evenly on the prepared baking sheet.
04 - Bake the meatballs for 15 minutes, or until they are visibly browned and mostly cooked through.
05 - While the meatballs bake, combine the BBQ sauce, honey, and apple cider vinegar in a small saucepan. Heat over medium-low heat, stirring occasionally, for approximately 5 minutes, until the glaze is warm and slightly thickened.
06 - Carefully remove the meatballs from the oven. Using tongs or a large spoon, transfer them to the saucepan containing the prepared BBQ glaze and gently toss until each meatball is thoroughly coated.
07 - Return the glazed meatballs to the baking sheet. Continue baking for an additional 8 to 10 minutes, or until the sauce is bubbling and the meatballs are fully cooked, reaching an internal temperature of 160°F.
08 - Serve the BBQ beef meatballs hot, offering additional glaze on the side for dipping, if desired.