Preheat your oven to 400°F and line a large baking sheet with parchment paper or foil for easy cleanup. This temperature allows the meatballs to bake through while developing a light golden exterior in exactly 20 minutes.

Combine ground beef, breadcrumbs, eggs, milk, minced onion, minced garlic, salt, and pepper in a large mixing bowl. Gently fold ingredients together with your hands just until combined—overmixing creates dense, tough meatballs that nobody enjoys.

Roll the mixture into 24 evenly-sized balls and arrange them on your prepared baking sheet without touching. Bake for 15 minutes while you prepare the sauce to save time during this party meatballs recipe.

While meatballs bake, melt butter in a saucepan over medium heat and whisk together BBQ sauce, brown sugar, apple cider vinegar, Worcestershire sauce, Dijon mustard, smoked paprika, and cayenne pepper. Simmer this sauce for 3-4 minutes, stirring frequently, until it darkens slightly and thickens.

Remove meatballs from oven after 15 minutes and transfer them to a serving bowl or slow cooker. Pour the warm sauce over easy BBQ cocktail meatballs party-ready bites and toss gently to coat every piece evenly.

If you're serving immediately, keep them warm in a slow cooker on low setting or return the coated meatballs to the oven at 250°F for up to 30 minutes. This prevents them from drying out while guests mingle.